is the name given to the giant robots

Mecha

A mech , is a science fiction term for a large walking bipedal tank or robot, including ones on treads and animal shapes.-Characteristics:...

 of The Big O

The Big O

is a Japanese animated television series created by director Kazuyoshi Katayama and designer Keiichi Sato for Sunrise Studios. The writing staff was assembled by the series' head writer, Chiaki J. Konaka....

anime series. Forty years prior to the events of the series, the world was turned into a vast desert wasteland and the survivors were left without memories. The megadeuses are portrayed as remnants of the previous civilization, a lost technology few citizens of Paradigm know how to control. The word is a blend of the Greek Megas, meaning "Great", and the Latin deus

Deus

Deus is Latin for "god" or "deity".Latin deus and dīvus "divine", are descended from Proto-Indo-European *deiwos, from the same root as *Dyēus, the reconstructed chief god of the Proto-Indo-European pantheon...

, meaning "god". The pilot of a Megadeus is a , taken from Latin.

The robots were designed by series creator Keiichi Sato

Keiichi Sato

is a mecha and character designer born in the Kagawa Prefecture of Japan in 1965.In 1996, Sato met with Kazuyoshi Katayama to begin work on The Big O. Until then, Sato's work consisted mainly of designing characters and supervising animation for anime series. The Big O is the first based on a...

, who also designed the Mazinger

Mazinger

is a long running series of manga and anime featuring giant robots or mecha. The name can also be pronounced "Mazinga", as it is has been known in several countries, including in the United States of America.-Series:The series in order:...

 mecha

Mecha

A mech , is a science fiction term for a large walking bipedal tank or robot, including ones on treads and animal shapes.-Characteristics:...

s featured on the Mazinkaiser

Mazinkaiser

is an anime OVA series, inspired by Go Nagai's Mazinger series. The OVA follows Kouji Kabuto, Tetsuya Tsurugi and the rest of the "Mazinger Team" as they fight against Dr. Hell's Mechanical Beasts....

OVA and the mutant creatures of The SoulTaker

The SoulTaker

For the Soul Taker film starring Joe Estevez see Soultaker . is an anime series that focuses on Kyosuke Date who was killed by his mother, and afterward gained the ability to turn into a monster known as "The SoulTaker". The show was Tatsunoko's first attempt at a more adult series.There is a...

 TV series.

The megadeuses are portrayed as semi-sentient beings, capable of acting on their own. The designs are strange and "more macho than practical." Unlike the giants of other robot anime, the megadeuses do not exhibit ninja-like speed nor grace or possess voice-activated special attacks; but for what they lack in agility, they more than make-up in power. The robots come armed with weaponry like missiles, piston

Piston

A piston is a component of reciprocating engines, reciprocating pumps, gas compressors and pneumatic cylinders, among other similar mechanisms. It is the moving component that is contained by a cylinder and is made gas-tight by piston rings. In an engine, its purpose is to transfer force from...

 powered punches, machine guns, and laser

Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of photons. The term "laser" originated as an acronym for Light Amplification by Stimulated Emission of Radiation...

 cannons.

The nature of the megadeuses is tied to the event forty years prior. In the final episode of the first season, Roger Smith has a flashback

Flashback (narrative)

Flashback is an interjected scene that takes the narrative back in time from the current point the story has reached. Flashbacks are often used to recount events that happened before the story’s primary sequence of events or to fill in crucial backstory...

 in the form of a nightmare: an army of Big-type megadeuses burn down the city as a group of bald-headed children look on. In the second season premiere, he experiences a lucid dream of a town without domes, where its citizens have not forgotten who they are and megadeuses are nowhere to be found. In the final episode, he gets another burst of memories: the city stands in ruins and multiple Big-type megadeuses fight amongst themselves while a winged giant oversees the onslaught.

In the tradition of Japanese monster movies

Kaiju

is a Japanese word that means "strange beast," but often translated in English as "monster". Specifically, it is used to refer to a genre of tokusatsu entertainment....

, The Big O features monsters modeled after conventional or mythological creatures. The series follows the "villain of the week

Villain of the week

"Villain of the week" is a term that describes the nature of one-use antagonists in episodic fiction, especially ongoing American genre-based television series...

" formula, meaning the protagonist is hired to do a job and by episode's end he must battle a monster using a giant robot of his own

Big O (mecha)

is the premier mecha of The Big O anime TV series, a black megadeus piloted by series protagonist Roger Smith. The robot was designed by series creator Keiichi Sato, who also designed the Mazinger mechas featured on the Mazinkaiser OVA and the mutant creatures of The SoulTaker TV series.- Design...

. Given the series' style, for some critics the robot battles seem out of place, while others praise the "over-the-top-ness" of their execution. The wildly varied nature of the robots stems from the fact the creators intended to create a toy line based on their design.

There is much confusion over what defines a "megadeus". The term is officially used to refer to all robots seen in the series, but is usually used by fans to exclusively refer to the humanoid "Bigs".

Dorothy-1

is the first giant robot that Big O does battle with in Act:01 and Act:02. It was built by Soldano, the creator of the android R. Dorothy Wayneright. Dorothy and Dorothy-1 are considered sisters to each other by Soldano, who soon dies after warning Roger about Beck's hijacking of the Dorothy units. Dorothy-1 is initially used by Beck to rob a bank of its mint plates, but is quickly destroyed by The Big O. R. Dorothy and Dorothy-1 are apparently intertwined technologically, as Beck proves capable of resurrecting Dorothy-1 by implanting R. Dorothy into the control unit of her sister unit. Throughout the episode, R. Dorothy displays a subtle synchronization with Dorothy-1 in the form of mimicking movement and sound.

Dorothy-1 is equipped with a pair of claws on each arm from which long metallic tentacles and power drills extend. These tools suggest that Dorothy-1 was built as a fairly benign robot, designed to save people trapped by rubble or prison cells. This is further proven in its overall lack of fighting capability. The Dorothy units, while seemingly trivial in the scope of the series, are some of the few objects constructed according to memories prior to The Event; the existence of such memories strongly implies that the megadeuses and other large robots were mass-produced using contemporary Paradigm City technology. The interactions between R. Dorothy and Dorothy-1 also help to illustrate the nature of megadeus-android relationships and suggest an even closer technological bond between megadeus-type units and androids, especially R. Dorothy. Beck's intricate knowledge of this relationship implies extensive previous experience with megadeuses prior to The Event on his part. Dorothy 1 bears a resemblance to one of Ultraman

Ultraman

is Japanese television series that first aired in 1966. Ultraman, the first and best-known of the "Ultra-Crusaders," made his debut in the tokusatsu SF/kaiju/superhero TV series, , a follow-up to the television series Ultra Q...

's monsters, Baltan

Baltan

is a race of alien creatures originally featured in the 1966 tokusatsu TV series, Ultraman. their first appearance was in Episode # 2, "Shoot the Invaders!" The Baltan aliens have been considered Ultraman's most popular foe. A Baltan recently appeared in episodes 33 and 34 of the Ultra series,...

.

Eel

A monster located near Electric City, the product of genetic research by a resident scientist. The , believed to be a deity of the lake, fed on electrical energy and was in a slumber under the lake until Angel reactivated the dam's turbine systems and reawakened the creature. The "Water God" could fire an electric shock from its mouth. It was blasted to bits by Big O's Chromebuster. The monster's remains were eventually gathered by the Paradigm Science group for a big project.

Archetype

The is a prototype Big-type megadeus introduced in the "Act 04: Underground Terror", buried amidst the ruins of a technological expo beneath Paradigm. The unmanned robot lacks the armor and faceplate worn by other Big-type megadeuses and appears to be in complete ruin. Upon contact with the android Dorothy Wayneright, the Archetype is revealed to be functional and aggressively seeks to either capture or crush both Dorothy Wayneright and Roger Smith.

The Archetype makes a brief appearance in Roger's dream in Act:14, as a character in a comic strip

Comic strip

A comic strip is a sequence of drawings arranged in interrelated panels to display brief humor or form a narrative, often serialized, with text in balloons and captions....

. In Act:17, it is revealed the Paradigm Corporation salvaged the megadeus as part of their effort to reconstruct the Big Duo Inferno.

Osrail

, who makes its appearance in Act:05, is a mysterious megadeus hidden beneath the sea, which activated to rescue a fallen police officer. It was capable of generating a fog which it used to project the image of a holographic ghost; allowing it to attack its opponent with homing energy blasts. It was defeated when Big O's radar revealed its true location to Roger and he used the Chromebuster to destroy it.

Constanze

Featured in Act:06. is piloted by the android R. Instro, after realizing that his late father's supposed legacy was a weapon made to destroy the city. Constanze produces sound waves capable of cracking Big O's armor and acting as a shield. It was defeated with the help of Dorothy's piano playing, which distracted Instro long enough for Roger to destroy its arms with a missile barrage. Instro's highly advanced, one-of-a-kind hands are permanently plugged into Constanze's controls once he inserts them, forcing him to destroy them to disconnect himself from the machine.

Dagon

The megadeus featured in "Act 07: The Call from The Past", is named after , a Phoenician agricultural deity often depicted as a sea creature. In the episode, the local fishermen stopped fishing out of fear of it. Without a pilot to control it, the titan goes on a rampage above water before it is defeated by Roger and the Big O. Its only displayed weaponry were two sets of missile batteries, one on each shoulder.

Dagon's servants are the "frog-men" who scared the fishermen into not going out to sea. They are actually a Paradigm investigation team wearing scuba-gear, hired to search for Memories in the South Sea. Their design is inspired by the Deep Ones, the frog-men worshippers of Dagon in Lovecraft's The Shadow Over Innsmouth

The Shadow Over Innsmouth

The Shadow Over Innsmouth is a novella by H. P. Lovecraft. Written in November-December 1931, the story was first published in April 1936; this was the only fiction of Lovecraft's published during his lifetime that did not appear in a periodical....

novella

Novella

A novella is a written, fictional, prose narrative usually longer than a novelette but shorter than a novel. The Science Fiction and Fantasy Writers of America Nebula Awards for science fiction define the novella as having a word count between 17,500 and 40,000...

.

Chimera

Featured "Act 08: Missing Cat". It is revealed that in Paradigm City, a cat or dog is worth a lot of money, since most animals were wiped out during or shortly after The Event that occurred forty years ago. A man named Eugene had been conducting experiments to bring back these types of animals using genetic research, funded by Paradigm until he back-stabbed them and started creating mutated versions. One of his creations was Pierrot, a cat created from the tissue of a boy named Roy Ferry. Pierrot found itself in the possession of R. Dorothy until Eugene kidnapped her to retrieve him. When Roger arrived at Eugene's lair, he encountered a large cat-like beast called the with tendrils on its back and a chest-mouth - a mutated Pierrot - but its memories of R. Dorothy allowed it to kill its creator before entering the burning laboratory to die.

Beck Victory Deluxe

Featured in Act:09, the is designed and assembled by Jason Beck. Its inferiority to the Big O is highlighted when it attempts to rise from underground, similar to the Big O, but gets stuck halfway. Beck Victory Deluxe fired missiles from its chest as well as laser beams from its finger tips. Nevertheless, it was no match for Big O who decapitated it with Sudden Impact

Eumenides

The robot featured in Act:10 is named after the creatures of Greek mythology

Greek mythology

Greek mythology is the body of myths and legends belonging to the ancient Greeks, concerning their gods and heroes, the nature of the world, and the origins and significance of their own cult and ritual practices. They were a part of religion in ancient Greece...

, the . It is a large-scale model of the toy-robot bombs used throughout the episode. Eumenides is the first megadeus of foreign origin to attack Paradigm City. It is controlled by , the woman who carries out the bombings. Built as a suicide model, Eumenides was packed with explosives, forcing Big O to fling it out of the city before safely detonating it with its eye lasers.

Daemonseed

Featured in Act:11, on Heaven's Day Eve, the grew into a massive Christmas tree that threatened to destroy the domes but Roger and Big O fought it off until it stopped growing.

Big Duo

is the second Big found in the series, piloted first by Schwarzwald. Schwarzwald planned to use the megadeus to destroy Paradigm, using its flight capability to attack the domes, or "false skies" as he calls them.

It was found by the former reporter in a hangar to the south of Paradigm City, as revealed in a flashback in Act:17. Roger is able to defeat Big Duo by grounding it and crushing its head, taking out one of its arms in the process. However, Big Duo still moves without a head or a pilot, and as a final act it reaches towards Paradigm City's center, suggesting a link with the domes or another potential pilot in the area. It is possible that the semi-sentient megadeus reaches for Paradigm HQ with the intentions of trying to carry out the wishes of Schwarzwald regardless of its defeat and crippling damage. R. Dorothy investigated the nearby area and found traces of Angel's presence. Big Duo is the only megadeus possessing the ability of flight, with the possible exception of Big Venus. Its propeller hands could also serve as a cutting weapon. Additional armaments included optic lasers, machine guns in its forearms, missile batteries in its chest, and a pair of high ordnance missiles stored in its knees. Big Duo was also capable of producing a smoke screen. Due to its great speed and great heft, it was effective at using it's entire body as a battering weapon. It's diving punch was equivalent to a piston-punch from Big O, and the two attacks canceled each other out.

Alex Rosewater salvages the wreckage of Big Duo, seen in Act:13. Using the salvaged remains of the Archetype, Rosewater is able to modify Big Duo into , now with a new head and arms with sharp red and white claws that enable it to drill, as well as a flame paint job on its arms. The repeating missile launchers in its chest were apparently removed for reasons unknown (leaving clean holes straight through the chest), and its optic lasers were converted from the typical twin beams to a single emitter in its larger left eye. Rosewater gives the megadeus to cyborg Alan Gabriel as payment for his services, with the cyborg hard-wired directly to the controls. Alan uses the Big Duo Inferno on Roger, who realized the megadeus is different when commenting "However, that isn't the megadeus's original form". After Roger uses the O Thunder attack to decapitate the megadeus, Alan manages to surprise and almost kill Roger. However, Big Duo Inferno suddenly attacks Alan with wires after displaying the message "Ye Guilty", implying Alan was not worthy to pilot the megadeus. Big Duo Inferno then launches itself into the air, slowly rising higher over the course of the final three episodes. Alan is seemingly killed by Big Duo's wiring before being ejected out. Schwarzwald's image appeared and his thoughts were heard by Alan as Big Duo rejected the mummified cyborg. Big Duo Inferno finally explodes when it collides with what appears to be a gigantic stage light, miles above Paradigm City.

Foreign Megadeuses

Introduced at the end of Act:13, the foreign megadeuses come from beyond the sea of Paradigm to attack the city. , the largest of the three, has a squarish body that contains a sonic-based weapon similar to that of Constanze. bears drills upon its arms. has an electrical attack generated from its hands and horn, which can arc to Carnot's hands and Robespierre's horn. They are revealed to be vessels designed to deliver the components of Big Fau to Alex Rosewater. The discarded parts are reassembled to form Bonaparte.

Glinda

Featured in Act:15, is a feminine robot constructed by Dr. Wayneright at his private estate as a security measure. Activated only once during an investigation of Wayneright's manor laboratory, it was easily destroyed by The Big O. It possessed a green laser that overheated metal, causing a whole line of tanks to explode. In addition, it possessed an extraordinary amount of agility despite the fact that it was actually slightly larger than Big O itself. It is the only megadeus in the series that appears to be capable of jumping and performing other related acrobatics. Its hands could be used as stabbing weapons as seen in its repeated knife-handing of Big O's arm shields. Its most formidable weapon was an extendable sword that it kept tucked away on a compartment on its left thigh. This sword has the distinction of being the only weapon in the series that was able to damage Big O's arm shields (a slash from the sword was seen to slightly cut into the shields). Unfortunately for Glinda, it was also a very fragile weapon, and it was destroyed by a punch from Big O when Glinda attempted to use a stabbing technique. The megadeus was then itself destroyed by the first display of the O Thunder weapon.

Like Dorothy, Glinda shares its name with a character

Glinda

Glinda is a fictional character in the Land of Oz created by American author L. Frank Baum. She is the most powerful sorceress of Oz, ruler of the Quadling Country south of the Emerald City, and protector of Princess Ozma.- Literature :Baum's 1900 children's novel The Wonderful Wizard of Oz...

 from The Wonderful Wizard of Oz

The Wonderful Wizard of Oz

The Wonderful Wizard of Oz is a children's novel written by L. Frank Baum and illustrated by W. W. Denslow. Originally published by the George M. Hill Company in Chicago on May 17, 1900, it has since been reprinted numerous times, most often under the name The Wizard of Oz, which is the name of...

, a work Chiaki Konaka occasionally references in his scripts.

Leviathan

Featured in Act:17, and most likely activated by Schwarzwald, the four claws can be energized and turn anything that it touches into sand. It appeared to have been called into the city by Dorothy when she accidentally began to speak in the same rapid and indiscernible manner as when she confronted the Archetype. Its purpose did not appear to be overtly destructive; its goal seemed only to be to incorporate Dorothy into itself. It was defeated when Big O turned its own energized claws against itself.

The megadeus is named after the biblical sea monster

Sea monster

Sea monsters are sea-dwelling mythical or legendary creatures, often believed to be of immense size.Marine monsters can take many forms, including sea dragons, sea serpents, or multi-armed beasts. They can be slimy or scaly and are often pictured threatening ships or spouting jets of water...

 Leviathan

Leviathan

Leviathan , is a sea monster referred to in the Bible. In Demonology, Leviathan is one of the seven princes of Hell and its gatekeeper . The word has become synonymous with any large sea monster or creature...

, and thus a counterpart to the Behemoth.

Beck the Great RX3

is featured in Act:18, "The Greatest Villain." Commissioned by Beck, with the purpose of finally humiliating Roger and Big O, and constructed by Yoshifura-Yakamoto Industries, in a ploy for lucrative contracts with the Paradigm Corporation.

The megadeus is a pastiche

Pastiche

A pastiche is a literary or other artistic genre or technique that is a "hodge-podge" or imitation. The word is also a linguistic term used to describe an early stage in the development of a pidgin language.-Hodge-podge:...

 of mecha

Mecha

A mech , is a science fiction term for a large walking bipedal tank or robot, including ones on treads and animal shapes.-Characteristics:...

s from "Super Sentai

Super Sentai

The is the name given to the long-running Japanese superhero team genre of shows produced by Toei Co., Ltd., Toei Agency and Bandai, and aired by TV Asahi...

", "Power Rangers

Power Rangers

Power Rangers is a long-running American entertainment and merchandising franchise built around a live action children's television series featuring teams of costumed heroes...

" and "Super Robot

Super Robot

is a term used in manga and anime to describe a giant robot or mecha, with an arsenal of fantastic super-powered weapons, extreme resistance to damage unless the plot calls for it, sometimes transformable or combined from two or more robots and/or vehicles usually piloted by young, daring heroes,...

" series with an overdone samurai motif covered in kanji

Kanji

Kanji are the adopted logographic Chinese characters hanzi that are used in the modern Japanese writing system along with hiragana , katakana , Indo Arabic numerals, and the occasional use of the Latin alphabet...

. Piloted by Beck and his two henchmen, Dove and T-Bone, three vehicles combine into the giant robot. The sequence is started by the command . ("Implement Final Formation!" in the dub) The image then fades to black, as if cutting to stock footage. T-Bone's trailer transforms into RX3's lower body. In a move reminiscent of Gekisou Sentai Carranger

Gekisou Sentai CarRanger

is a Japanese tokusatsu television show. It was Toei's twentieth production of the Super Sentai television series. Its action footage was used in Power Rangers Turbo.-Plot:...

s RV Robo & Power Rangers: Turbo

Power Rangers: Turbo

Power Rangers Turbo is the third installment in the long-running Power Rangers franchise of television shows. The show was prefaced with the second movie in the franchise, Turbo: A Power Rangers Movie...

s Turbo Megazord, the blue vehicle performs a bootleg turn

Bootleg turn

A bootleg turn is a radical driving maneuver intended to reverse the direction of travel of a forward-moving automobile by 180 degrees in a minimum amount of time while staying within the width of a two-lane road...

 to form the legs and waist. Dove's construction vehicle makes up the upper body, pulling itself up onto the blue lower half. The torso sprouts hands from a drill and a pincer, as do Getter Robo

Getter Robo

is a Super Robot manga series created by Go Nagai and Ken Ishikawa, as well as an anime series produced by Toei Animation. The series was broadcast on Fuji TV from April 4, 1974 to May 8, 1975, with a total of 51 episodes.- Plot :...

's Getter-2 form. Beck's sports car jumps off a nearby ramp and dives into a recess in the head to form the cockpit, in an homage

Homage

Homage is a show or demonstration of respect or dedication to someone or something, sometimes by simple declaration but often by some more oblique reference, artistic or poetic....

 to Mazinger Z

Mazinger Z

, known briefly as Tranzor Z in United States, is a Super Robot manga and anime series created by Go Nagai. The first manga version was serialized in Shueisha Weekly Shōnen Jump from October 1972 to August 1973, and it later continued in Kodansha TV Magazine from October 1973 to September 1974. In...

, completing the sequence. After this display of bravado, much bragging, and overly-dramatic poses, Roger (having had an inordinately irritating day up to this point) and Big O destroyed the RX3 in a single blast of O Thunder, ending the fight before it could actually start.

Construction Robot

Featured in Act:19. A robot taken over by the Union for use in obtaining memories from advanced androids such as R. Dorothy. Its weaponry included only construction tools such as a digging claw, a chainsaw, a drill, and a large nail gun. It is disabled by Big O with a single punch, as it was never really designed with combat in mind.

Bonaparte

is built from the remains of the three foreign megadeuses after Big Fau's parts were extracted from them. It began its rampage through the main dome in Act:20, while Big O attempted to stop it, only for Roger to abandon Big O to save Dorothy. Its weaponry was, while limited, remarkably destructive. Said weapons included only a pair of large drills and a purple, electricity-like energy attack, but the energy attack was powerful enough to destroy a very large portion of the superstructure of Paradigm's main dome. It was destroyed by Alex Rosewater and Big Fau.

Hydra Eel

The is an advanced triple-headed version of the Eel from Act:03. When the Eel's remains were recovered by the Paradigm Science Group, they used their genetic engineering to create a mutated albino clone

Cloning

Cloning in biology is the process of producing similar populations of genetically identical individuals that occurs in nature when organisms such as bacteria, insects or plants reproduce asexually. Cloning in biotechnology refers to processes used to create copies of DNA fragments , cells , or...

. The Hydra was used by Paradigm's systems until Vera detonated the creature's holding cell, letting it loose on the city. Like its genetic template, the creature attacked with extremely large electrical blasts; this included a supersized blast that combined the energy of all three heads into a single charged blast. It also had a remarkable regenerative ability, as seen when it was able to fully regrow two of its three heads in a matter of seconds. The research team's original intention was to use the Hydra's bio-electricity to reactivate Big Fau, which they achieved by extending a lightening rod and siphoning off the Hydra's electricity as its superblast bounced off of an energy shield of Big O's. Roger Smith and Big O killed it with said shield, called the Plasma Gimmick, by expanding it towards the Hydra. It then completely dissolved on contact with the shield.

Big Fau

First appearing in Roger's memories of "The Event" in Act:13, and first seen in action during Act:21, aptly titled "The Third Big", is the third in the series which had a certain importance and was piloted by Alex Rosewater. Considered by Alex to be the most powerful "Big". The parts for Big Fau were transported within the three foreign megadeuses that fought Big O offshore of Paradigm City at the end of the first season and the beginning of the second season. After the foreign megadeuses were disabled (but not destroyed), they were recovered by the Paradigm science team and Big Fau's parts were salvaged and re-assembled secretly under the supervision of Alex. The megadeus, however, lacked a Memory Core. Ultimately, this vital component was disregarded initially by Alex, and Big Fau was activated and piloted by Rosewater.

Big Fau's primary weapons were the turbines mounted just below its hands. When activated, the turbines could grind through practically any material or even allow Big Fau to drill its fist straight through an opponent's body. The fists themselves could also spin, giving the megadeus' punches an incredible amount of destructive power. Additional weapons included two heavy beam cannons mounted in its shoulders and laser projectors that extended on flexible periscope-like extensions from its back. Big Fau was also able to fire its arms at an opponent, the turbines drilling through any obstacle before detonating. Big Fau is equipped with some kind of energy shield which can repel Big O's fists and other matter-based attacks (missiles, bullets etc.). Judging by Big Fau's streamlined appearance, its turbine wrists, its ability to travel effortlessly through the water, its conning tower

Conning tower

A conning tower is a raised platform on a ship or submarine, often armored, from which an officer can con the vessel; i.e., give directions to the helmsman. It is usually located as high on the ship as practical, to give the conning team good visibility....

 shaped head as well as a conning tower on its back, and the flexible periscope-like laser cannons on its back, it is likely that Big Fau units were used primarily for naval combat, functioning as heavily armed amphibious

Amphibious warfare

Amphibious warfare is the use of naval firepower, logistics and strategy to project military power ashore. In previous eras it stood as the primary method of delivering troops to non-contiguous enemy-held terrain...

 craft, and providing ocean-based combat support for land- and air-based megadeuses.

During its maiden battle against the Union Megadeus Bonaparte, Alex could completely control the Big, allowing him to tear Bonaparte to pieces before finally destroying it with Fau's dorsal beams. Once Bonaparte was vanquished, however, Big Fau's dorsal beams disobeyed Alex's orders and began to assault the domes. In response to Alex's claim that he was Big Fau's dominus, Big Fau displayed the message "Cast in the Name of God... Ye Not-" before shutting down. Later, Big Fau was jerry-rigged into working by Jason Beck using R. Dorothy's Memory Core, finally completing Fau and allowing it to declare Rosewater "Not Guilty." The Big Fau is the only Megadeus in the series to defeat the Big O after a challenge from Roger Smith. Fau is also the only known Megadeus to fuse with its pilot, Rosewater, via a series of cables plugged into its pilot's back, although Big O attempted to do the same with Roger, and Big Duo wrapped, and subsequently mummified, Alan Gabriel before rejecting him with the message "Ye Guilty". Big Fau was eventually disabled by Big O's Final Stage at the end of the Act:26 and removed by Big Venus. Big Fau may be a reference to Frankenstein's Monster

Frankenstein's monster

Frankenstein's monster is a fictional character that first appeared in Mary Shelley's novel, Frankenstein, or The Modern Prometheus. The creature is often erroneously referred to as "Frankenstein", but in the novel the creature has no name...

 because of its long head and bolt-like ears, as well as the nature of its reconstruction.

Behemoth

The , named after the creature

Behemoth

Behemoth is a mythological beast mentioned in the Book of Job, 40:15-24. Metaphorically, the name has come to be used for any extremely large or powerful entity.-Plural as singular:...

 mentioned in the Book of Job

Book of Job

The Book of Job , commonly referred to simply as Job, is one of the books of the Hebrew Bible. It relates the story of Job, his trials at the hands of Satan, his discussions with friends on the origins and nature of his suffering, his challenge to God, and finally a response from God. The book is a...

, appears at the end of Act:25. It is many times larger than the other megadeuses, and bears large drills on its shoulders and a quadruped design. The Behemoth is activated by Vera Ronstadt, the leader of the Union, and is only seen for a brief time. As Big O lifts it into the air it is crushed under the weight of debris falling from above the city.

Big Venus

appears briefly in the series finale after Angel realizes her role in Paradigm City and transforms into the megadeus. Venus' design is almost identical to Big O, with the exception of a redesigned, albeit similar, face featuring a rictus grin, and a pair of wings it is shown to have in a flashback to the Event. When it appears in the present day, it appears with inverted colors and its wings are removed. Roger confronts Big Venus, which begins erasing everything simply by walking past it until only the two Bigs remain. Roger uses his skills as the Negotiator to convince Angel to let people keep their memories, (which represent self-awareness) as Big Venus slowly approaches. Big O and Big Venus then walk into and pass through one another, and Roger is able to confront Angel as the Director. Big Venus may be a command version of Big O's model, as it is seen overseeing the Big-type megadeus rampage in flashbacks of The Event.

The name "Venus" alludes to the "morning star

Venus

Venus is the second planet from the Sun, orbiting it every 224.7 Earth days. The planet is named after Venus, the Roman goddess of love and beauty. After the Moon, it is the brightest natural object in the night sky, reaching an apparent magnitude of −4.6, bright enough to cast shadows...

" and the fallen angel

Fallen angel

Fallen angel is a concept developed in Jewish mythology from interpretation of the Book of Enoch. The actual term fallen angel is not found in either the Hebrew Bible or the New Testament. Christians adopted the concept of fallen angels mainly based on their interpretations of the Book of...

 of Christian mythology

Christian mythology

Christian mythology is the body of myths associated with Christianity. In the study of mythology, the term "myth" refers to a traditional story, often one which is regarded as sacred and which explains how the world and its inhabitants came to have their present form.Classicist G.S. Kirk defines a...

, Lucifer

Lucifer

Traditionally, Lucifer is a name that in English generally refers to the devil or Satan before being cast from Heaven, although this is not the original meaning of the term. In Latin, from which the English word is derived, Lucifer means "light-bearer"...

.

Dantalion

hibernated underground until unearthed by a scientist looking for memories.

Gigadeus

In the manga Beck traveled deep underground after repeated defeats by Roger and Big O, where he happened upon the . When he traveled underground, Beck was flooded with a vast wealth of memories hidden down there. Beck came to believe Big O allowed Roger to enter the underground unfazed by the vast amount of memories. Even after returning to the surface, Beck began to repeatedly return to the underground to experience the memories. As a consequence, Beck began to succumb to the memories and his henchmen soon noticed Beck's new lackluster attitude towards the massive spending he was doing, especially when Beck nonchalantly bought his own dome. While Roger was fighting his henchmen, Beck used the Gigadeus to break the ground beneath Big O and pull it down to the underground expo where Schwarzwald found the megadeus Archetype.

The Gigadeus is a three-headed, three-legged robot which greatly resembles the other Big robots. Whether or not it had a 'Big' name like Big O is unknown. Beck coined the term while comparing his much bigger and stronger robot, a Gigadeus, to the smaller, seemingly weaker Big O, a megadeus. The Gigadeus is massive, even by megadeus standards, being three times larger than Big O. Not only is the Gigadeus huge, but it is also heavily armored, being able to take a punch from Big O without even being phased. Not only is the Gigadeus heavily armored, it is also quite well armed. Each of the three heads is different, the right head has a short dragon mouth and can breathe fire, the center head can fire lasers from its main eyes and four other holes above its eyes, while the left head has a visor over its eyes and has no identifiable power. Each of its three heads can extend its neck out from its body with tentacle-like necks which can wrap around things. Attached to each elbow is a massive drill, with spikes at its base, which can be brought to bare by rotating the hands to face backwards. The Gigadeus can also use its middle leg to send Big O flying with a single powerful kick. During the battle Roger began having hallucinations of objects from history, objects, animals, and even people, which turned out to be memories which the Gigadeus was showing Beck. Beck questioned Roger whether Big O had shown Roger similar memories. Beck also expressed a new all-consuming greed to keep these memories all to himself by eliminating Roger. The Gigadeus is ultimately destroyed when Roger fires Big O's Chrome Buster into its chest, which kills Beck in the process. Beck's soulless, hollow eyes and hysterical smile haunts Roger after the battle.

Giga is Greek for Giant Therefore the direct translation of Gigadeus is "Giant God".