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.

“The Fantastic Four: First Steps,” the first film about the superheroes made under the guidance of Kevin Feige and the Walt Disney Co., earned $118 million in its first weekend in 4,125 North America...

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