With #66, Roy Thomas returns—for one issue—to talk about the aftermath of the Professor’s return, but this is the last issue of The X-Men for years. Just as quickly as Thomas and Adams made it an incredible, can’t-miss comic, new issues were cancelled and Marvel reprinted old issues from now through #93. Idiot comic buyers back in the late 1960s didn’t support the title enough to keep it running. Pfug.
Also, they fight The Hulk. It’s a done-in-one, because this is the final issue of the series. Frankly, they could have left well enough alone after they introduced Sunfire.
Creators: Roy Thomas, Sal Buscema