How Franklin Richards, the power cosmic and Doctor Doom's appearance in "The Fantastic Four: First Steps" credit scene affects "Avengers: Doomsday."

First Steps is finally in theaters, bringing the First Family to the Marvel Cinematic Universe. Now, all roads lead to Avengers: Doomsday, the next big crossover event in Marvel’s uneven but never-ending comic book movie saga.

Robert Downey Jr's Doctor Doom has finally stepped into the Marvel Cinematic Universe. In one of the most crucial credit scenes for 'The Fantastic Four: First Steps,' viewers were introduced to the masked metal villain,

Credit: Marvel Studios In their MCU debut, the Fantastic Four become a Fantastic Five with the arrival of Reed and Sue's son, Franklin Richards. Worries that he might not be "normal" are confirmed in Fantastic Four: First Steps when Galactus recognises that the boy can wield an unlimited energy known as the Power Cosmic (presumably because of the "cosmically compromised DNA" shared by both of his parents).

Sometimes, the most effective teases are the ones that don't show you what you're looking for, but rather, highlight its very absence.

We can confirm that The Fantastic Four: First Steps has two credit scenes to enjoy, one that comes after the animated part of the credits and then one at the very end after all the credits have wrapped up.

In Marvel Comics, Doom’s fixation on Franklin is legendary. He views the boy’s near-limitless powers as the key to creating and ruling Battleworld, a twisted reality of his own making as seen in Secret Wars.

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 Russo Brothers have warned fans to wait through the credits when they watch The Fantastic Four: First Steps for an Avengers: Doomsday tease, while Robert Downey Jr. is teasing his Doctor Doom research.

First Steps introduces a fresh set of faces for the MCU, there’s one villain that fans have been waiting with bated breath to see on screen. Spoilers for The Fantastic Four: First Steps and possible future MCU content below As the main villain of Marvel’s Multiverse saga,