was a Japanese television program produced by Tsuburaya Productions

Tsuburaya Productions

is a Japanese special effects studio founded in 1963 by special effects wizard Eiji Tsuburaya and was run by his family, until October 2007, when the family sold the company to advertising agency TYO Inc. The studio is best known for producing the original Ultraman TV series, as well as the Ultra...

 that aired from 1977 to 1978 on Tokyo 12 Channel. It combined Tsuburaya's trademark suitmation tokusatsu

Tokusatsu

is a Japanese term that applies to any live-action film or television drama that usually features superheroes and makes considerable use of special effects ....

 techniques with Japanese Animation, so this program can be categorized anime

Anime

is the Japanese abbreviated pronunciation of "animation". The definition sometimes changes depending on the context. In English-speaking countries, the term most commonly refers to Japanese animated cartoons....

 or Daikaiju tokusatsu. The show runs for about 39 episodes.

Plot

Dinosaurs reappearing on Earth, stronger and more intelligent than before, led by Dinosaur Satan Gottes, and this time they are back to rule earth once more and wipe out humankind. They are alive and even thriving, in an underground Empire they built. In 1986, Ururu, the leader of dinosaurs, declares war against humanity. In an attempt to reclaim the Earth's surface, some of the dinosaurs evolve into deadly monsters, and start wreaking havoc on the human population centers around the globe. Story revolves around the D Force (D戦隊 D Sentai), and its two members, a brother and sister team of Tachibana Ai (立花 愛) and Tachibana Zen (立花 善), the Special OPs force, whose mission is to combat monsterized dinosaurs and protecting the humanity at all cost. However, early in the series the siblings suffered a near fatal injury from the massive explosion during the test of a prototype super-tank, "predecessor to Izenborg". However they survived, barely clinging to life. But in order to keep them alive they needed to receive a cybernetic body parts and other implants so they could function normally within the society, and to synchronize with their combat vehicle and form Aizenborg (Ai + Zen + Cyborg) (called Gemini in the US movie) and fight the Dino-Army.

A few episodes were released in the US a decade later in a compilation movie called Attack of the Supermonsters.