After looking at hundreds of comic book covers, it becomes quickly apparent that not every cover is 100% original. Whether done intentionally or even underhandedly, there's something about uncovering these "swipes" that adds a new element of fun to reading and collecting comics. Pitting the Hulk against the Fantastic Four has always been legendary. This cataclysmic rivalry began in FF #11 but #26 took it to an all-new level of action. Decades later, Chris Sprouse did a great job with this cover swipe from Tom Strong.
Fantastic Four #26 Fantastic Four #26
May 1964
Jack Kirby
 Tom Strong #21 Tom Strong #21
December 2003
Chris Sprouse
On Ebay: Fantastic Four | Tom Strong | Hulk