Fantastic Four #6

In "Captives of the Deadly Duo!, Part 1," the Fantastic Four face a shocking alliance as Dr. Doom teams up with the Sub-Mariner, setting the stage for a battle that tests loyalty and trust. When Human Torch discovers Invisible Girl hiding a photo of the Sub-Mariner in a book, old tensions flare—especially as the two enemies now stand side by side. Written by Stan Lee and illustrated with dynamic energy by Jack Kirby, with inks by Dick Ayers, colors by Stan Goldberg, and letters by Terry Szenics, this 1962 issue features a cover by Kirby and Ayers that captures the clash of titans.