Avengers Assemble! You might love this very catchphrase of Marvel’s superhero group, the mighty Avengers. Created by the famed superhero creator duo Stan Lee & Jack Kirby, Avengers made their first appearance via The Avengers #1 comic book in the September of 1963. In fact, the superhero team is a refurbishment of the superhero creator duo’s earlier superhero team, All-Winners Squad.