Masters of the Universe Bible (1982)

The Masters of the Universe Bible is a document, originally written by Michael Halperin on 1 December 1982 to serve as a series bible for the animated series He-Man and the Masters of the Universe. Building upon the backstory previously established in the comics and his own fascination with mythology, Michael Halperin fleshed out the history and geography of Eternia and developed origins for He-Man and his friends and allies, Castle Grayskull, and the Evil Warriors.