Not every mid-credit scene is this intense. In the latest Marvel movie, “Fantastic Four: First Steps” there’s a cameo that you will want to stick around to watch. (The scene appears after only a few minutes into the credits.) Warning: Spoilers ahead!

We see Sue Storm picking out books for little Franklin, the wunderkind who will eventually become one of the most powerful mutants in the Marvel lexicon. As Sue turns around, she sees a mysterious figure who's well known to comic book fans: Doctor Doom, the nemesis from next year's "Avengers: Doomsday." Here’s everything we know about that film coming up in December of next year and its big bad, plus a few other details.

Robert Downey Jr. returns to the MCU

No one is quite sure how Marvel will pull this off, but somehow, some way, Downey —

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