So yes, Doctor Doom does appear in First Steps. In the mid-credits scene, we jump four years into the future and see Sue Storm and her son Franklin reading together in their home in the Baxter Building.

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.

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,

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.

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.

The Marvel Cinematic Universe officially has its Fantastic Four. Or should we call it five? The new film, which is in theaters now, is largely centered around the fact that Reed Richards (Pedro Pascal) and Sue Storm (Vanessa Kirby) have a child named Franklin.

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.

A good chunk of Doomsday could focus on a clash between Avengers and X-Men with RDJ’s Doom cackling in the background, with a kidnapped Franklin by his side. The premise certainly gives the Fantastic Four a reason to breach their multiversal walls and zip over to 616 to meet the New Avengers.