Diablo is a supervillain appearing in American comic books published by Marvel Comics. The character is depicted as an evil alchemist, and an enemy of the Fantastic Four. Created by writer Stan Lee and artist Jack Kirby, the character first appeared in Fantastic Four #30.

The Fantastic Four is a superhero team appearing in American comic books published by Marvel Comics. The team debuted in The Fantastic Four #1, helping usher in a new level of realism in the medium. It was the first superhero team created by artist/co-plotter Jack Kirby and editor/co-scripter Stan Lee, and through this title that the "Marvel method" style of production came into prominence.