Skaar is a fictional character, a comic book superhero appearing in American comic books published by Marvel Comics, usually as a supporting character in stories featuring his father, the Hulk, who conceived Skaar with the extraterrestrial Caiera during the 2006–2007 "Planet Hulk" storyline. Created by writer Greg Pak and artist John Romita Jr., the earliest version of the character appeared in a cameo in an alternate history story in What If? Planet Hulk #1, in which the character was drawn by Rafa Sandoval. The Earth-616 version of the character appeared in World War Hulk #5, by Pak and Romita, Jr.

The Hulk is a superhero appearing in American comic books published by Marvel Comics. Created by writer Stan Lee and artist Jack Kirby, the character first appeared in the debut issue of The Incredible Hulk. In his comic book appearances, the character, who has dissociative identity disorder (DID), is primarily represented by the alter ego Hulk, a green-skinned, hulking and muscular humanoid possessing a limitless degree of physical strength, and the alter ego Dr. Robert Bruce Banner, a physically weak, socially withdrawn, and emotionally reserved physicist, both of whom typically resent each other.