Everworld is a fantasy novel series written by K. A. Applegate

K. A. Applegate

Katherine Alice Applegate is an American author, best-known as the author of the Animorphs, Remnants, Everworld and other book series, although some of the books in these series are ghostwritten by other authors. Applegate's most popular books are science fiction, fantasy, and adventure novels...

 and published by Scholastic

Scholastic Press

Scholastic is a global book publishing company known for publishing educational materials for schools, teachers, and parents, and selling and distributing them by mail order and via book clubs and book fairs. It also has the exclusive United States' publishing rights to the Harry Potter book...

 between 1999 and 2001. It consists of twelve books.
The idea of Everworld is that, many years ago (said to be near 1,000 years in Everworld time), the ruling gods of every pantheon

Pantheon (gods)

A pantheon is a set of all the gods of a particular polytheistic religion or mythology.Max Weber's 1922 opus, Economy and Society discusses the link between a...

 (including Zeus

Zeus

In the ancient Greek religion, Zeus was the "Father of Gods and men" who ruled the Olympians of Mount Olympus as a father ruled the family. He was the god of sky and thunder in Greek mythology. His Roman counterpart is Jupiter and his Etruscan counterpart is Tinia.Zeus was the child of Cronus...

, Odin

Odin

Odin is a major god in Norse mythology and the ruler of Asgard. Homologous with the Anglo-Saxon "Wōden" and the Old High German "Wotan", the name is descended from Proto-Germanic "*Wodanaz" or "*Wōđanaz"....

, and Ra

Ra

Ra is the ancient Egyptian sun god. By the Fifth Dynasty he had become a major deity in ancient Egyptian religion, identified primarily with the mid-day sun...

) assembled and agreed to abandon this world, known as the Old World, and create a new one called Everworld.