The FF are being attacked by their own equipment, and have no idea who is behind it at first. They soon realize that the Sandman has upgraded his equipment and taken a crash course in science, and he came prepared to face them. The FF manage to drive him off, but only at great risk and terrible cost.
| Barcode | N/A |
|---|---|
| Character | Karnak (Karnak Mander-Azur), Lockjaw, Sandman (William 'Flint Marko' Baker), Crystal (Crystalia Amaquelin-Maximoff), Sam Thorpe, Wyatt Wingfoot, Triton, Gorgon (Inhumans) (Gorgon Petragon), Black Bolt (Blackagar Boltagon), Human Torch (Jonathan 'Johnny' Storm), Mr. Fantastic (Reed Richards), The Thing (Benjamin J. Grimm), Spider-Man (Peter Parker), Medusa (Medusalith Amaquelin-Boltagon), Silver Surfer (Norrin Radd), Mary Jane Watson-Parker, Invisible Woman (Susan Storm Richards) |
| Cover Date | April 1967 |
| Issue | 61B |
| Rating | N/A |
| Artist | N/A |
| Colorist | N/A |
| Cover Artist | N/A |
| Cover Colorist | N/A |
| Cover Inker | Joe Sinnott |
| Cover Painter | N/A |
| Cover Penciller | Jack Kirby |
| Cover Separator | N/A |
| Editor | Stan Lee |
| Editor in Chief | Stan Lee |
| Inker | Joe Sinnott |
| Layouts | N/A |
| Letterer | Sam Rosen |
| Painter | N/A |
| Penciller | Jack Kirby |
| Plotter | N/A |
| Scripter | N/A |
| Separator | N/A |
| Translator | N/A |
| Writer | Stan Lee |
