What If?

Jack's satirical version of the original 1960s Marvel Bullpen transformed into the Fantastic Four. From the comic book What If? # 11 (1978). This scan is from the original art. Inks by Jack's long-time Fantastic Four collaborator, Joe Sinnott.
A double-splash featuring editor Stan Lee as Mr. Fantastic, production manager Sol Brodsky as the Human Torch, Kirby as the Thing, and office manager Flo Steinberg as the Invisible Girl. This scan is also from the original art. Inks by Mike Royer.

A close-up of Kirby as the Thing.

Jack working at his artboard. Signed by Jack on the original artboard.