77. Mr. Fantastic vs. Doctor Doom (Timeslip)
This story was one of the last ones that Walt Simonson told during his Fantastic Four run (in fact, was it the very last?) and it was perhaps his best one!
Fantastic Four #352 is a battle between Doctor Doom and Reed Richards, only it takes place through the time stream (the story is called Timeslip), so they are constantly going back and forth through time in the issue, so what Simonson does is tell the story by having small notations telling the reader where they are in time. You have to go all throughout the issue to different pages to follow the fight as they leap around in time.
It’s an absolutely fascinating idea, and Simonson even works the cover into the fun, as well (note the time stamp on the cover) - that cover counts as one of the fight scenes in the book.