Ego the Living Planet is a fictional character, a supervillain in the Marvel Comics Universe. The character first appeared in Thor #132 (Oct. 1966) and was created by writer Stan Lee and artist Jack Kirby.
Ego was created by Jack Kirby during a phase in which he was fascinated with the universe: Ego; the alien Kree and The Colonizers immediately followed the creation of Galactus and helped establish Marvel Comics' own "space age mythology".
Ego the Living Planet was initially introduced in the title Thor issue #132 (September 1966), and was created by writer Stan Lee and artist Jack Kirby.
Ego also played a prominent role in the Maximum Security storyline, appearing in Avengers #35 (Dec. 2000); Maximum Security: Dangerous Planet (Oct. 2000); Iron Man #34 - 35 (Nov. - Dec. 2000); X-Men Unlimited #29 (Dec. 2000); Gambit #23 (Dec. 2000) and Maximum Security #1 - 3 (Dec. 2000 - Jan. 2001).
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Official Site: Marvel Comics
Links: Wikipedia Bio on Marvel.com Immortal Thor: Ego