Thor Escapes Ego
The Mighty Thor #133 (October 1966)
Art by Jack Kirby & Vince Colletta
Words by Stan Lee
In a bio-verse within the Black Galaxy there existed Ego, The Living Planet. A planet with consciousness and intelligence who wished to conquer other galaxies. It would become one of the more unique Marvel villains and fought Thor more than once.
I hope Marvel brings Ego back sometime in the future. It really is an interesting character.