Klaatu
Comic book character
Klaatu is a fictional alien appearing in American comic books published by Marvel Comics. He first appeared in The Incredible Hulk vol. 2 #136-137, a two-part story which credits Roy Thomas as sole writer, but was in fact scripted by Thomas over a... Wikipedia
Fictional universe: Marvel Universe
Creators: Herb Trimpe, Gerry Conway, and Roy Thomas
Abilities: energy absorption, self destruction
First appearance: The Incredible Hulk vol. 2 #136 (Feb. 1971)