The publisher previewed the covers for December's Fantastic Four #601 and FF #13, both written by Jonathan Hickman.
The latter cover is particularly intriguing, featuring a saluting Franklin Richards standing before an FF uniform-wearing Doctor Doom.
"In Doom we trust," reads the caption.
The other image shows the Thing and his catchphrase "It's clobberin' time".
Hickman has hinted at a vital role for Doom during his run on the titles.
Fantastic Four went on hiatus last year, replaced by FF, standing for the Future Foundation, which Mr Fantastic created as a problem-solving think tank.
The title will return with Fantastic Four #600, and will be illustrated by Steve Epting moving forward.
FF will continue under artist Juan Bobillo.