First Steps line up with the end of Thunderbolts* as the franchise builds to the release of the epic Avengers: Doomsday in December 2026? CinemaBlend's own Jeff McCobb recently broached that subject in an interview with director Matt Shakman during the Los Angeles press day for the new 2025 movie,

Thanks to the Thunderbolts* post-credits scene, we'd all assumed we knew how The Fantastic Four: First Steps was going to end; with Marvel's First Family having hopped on a ship and travelling, somehow, to Earth-616 on the Sacred Timeline. You know, the universe in which the Avengers exist...

The post-credits scenes of Fantastic Four: First Steps and Thunderbolts are not directly connected. However, it could point towards what we could see in Avengers: Doomsday. There's a chance that the post-credit scene of Fantastic Four: First Steps kicks off Avengers: Doomsday, as Doom might kidnap Franklin and escape to Earth 616.