Fantastic Four 3

There isn't a "Fantastic Four 3" movie that was actually released, but the planned sequel to the 2007 film Fantastic Four: Rise of the Silver Surfer was canceled and would have focused on Doctor Doom, the Puppet Master, and the Super-Skrull, potentially introducing Black Panther and the birth of Franklin Richards, with the main story revolving around Ben Grimm's relationship with Alicia Masters.