Skaar is a fictional superhero that appears in comics published by Marvel Comics, usually as a supporting character to Hulk. He is the son of the Hulk and the extraterrestrial Caiera, who conceived him during the "Planet Hulk" storyline. Created by writer Greg Pak and artist John Romita, Jr., he first appeared in What If? Planet Hulk #1 (cover-dated Dec. 2007).