Superman was born on the planet Krypton and named Kal-El. As a baby, he was sent to Earth in a small spaceship by his scientist father Jor-El moments before Krypton was destroyed in a natural cataclysm. His ship landed in the American countryside; he was found and adopted by farmers Jonathan and Martha Kent, who named him Clark Kent. Clark displayed various superhuman abilities, such as incredible strength and impervious skin.

Iron Man is a fictional superhero appearing in American comic books published by Marvel Comics. The character was co-created by writer and editor Stan Lee, developed by scripter Larry Lieber, and designed by artists Don Heck and Jack Kirby. The character made his first appearance in Tales of Suspense #39 (cover dated March 1963), and received his own title in Iron Man #1 (May 1968).

Spider-Man is a fictional superhero created by writer-editor Stan Lee and writer-artist Steve Ditko. He first appeared in the anthology comic book Amazing Fantasy #15 (August 1962) in the Silver Age of Comic Books. He appears in American comic books published by Marvel Comics, as well as in a number of movies, television shows, and video game adaptations set in the Marvel Universe. In the stories, Spider-Man is the alias of Peter Parker, an orphan raised by his Aunt May and Uncle Ben in New York City after his parents Richard and Mary Parker were killed in a plane crash. Lee and Ditko had the character deal with the struggles of adolescence and financial issues, and accompanied him with many supporting characters, such as J. Jonah Jameson, Flash Thompson, Harry Osborn, romantic interests Gwen Stacy and Mary Jane Watson, and foes such as Doctor Octopus, Green Goblin and Venom. His origin story has him acquiring spider-related abilities after a bite from a radioactive spider; these include clinging to surfaces, shooting spider-webs from wrist-mounted devices, and detecting danger with his "spider-sense".

When Spider-Man first appeared in the early 1960s, teenagers in superhero comic books were usually relegated to the role of sidekick to the protagonist. The Spider-Man series broke ground by featuring Peter Parker, a high school student from Queens behind Spider-Man's secret identity and with whose "self-obsessions with rejection, inadequacy, and loneliness" young readers could relate.[9] While Spider-Man had all the makings of a sidekick, unlike previous teen heroes such as Bucky and Robin, Spider-Man had no superhero mentor like Captain America and Batman; he thus had to learn for himself that "with great power there must also come great responsibility"—a line included in a text box in the final panel of the first Spider-Man story but later retroactively attributed to his guardian, the late Uncle Ben.