When Entertainment Weekly asked Fantastic Four: First Steps director Matt Shakman if Downey Jr. filmed that post-credits scene, the filmmaker pleaded the fifth. "For others to talk about," he teased. However, Shakman did reveal that it was the Russo brothers who helmed the post-credits scene since it was shot for Avengers: Doomsday.

Robert Downey Jr. has teased yet another Marvel comic in his collection of Avengers: Doomsday reading material – and this one is even more wild and cryptic than the last.

In the first moments of “First Steps,” Sue sets down a positive pregnancy test before a surprised Reed.