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.

Curious to know what Doctor Doom’s powers are in Marvel? Phase 6 has kicked off with the release of The Fantastic Four: First Steps, which will eventually lead into Avengers: Doomsday. In it, Marvel’s next big bad is played by Robert Downey Jr.