Doomsday theory explores how the Fantastic Four might travel to Earth-616. It suggests Reed Richards uses Galactus’ ancient ship tech, combined with his own inventions, to build multiversal transport and rescue Franklin Richards from Doctor Doom’s grasp.

In a 1982 arc by John Byrne, Franklin gets frustrated trying to solve a Rubik’s Cube and uses his powers to age himself into an adult body, though he couldn’t actually gain more emotional maturity. He winds up going back to being a kid, placing restrictions on his own abilities to allow him to have something of a normal childhood.

The upcoming film stars Pedro Pascal as Reed Richards/Mr. Fantastic, Vanessa Kirby as Sue Storm/Invisible Woman, Ebon Moss-Bachrach as Ben Grimm/The Thing and Joseph Quinn as Johnny Storm/Human Torch.

After a number of false starts, the Fantastic Four have another feature adaptation in the retro-pastiche Fantastic Four: First Steps. This isn’t the first time Mr. Fantastic and co. have appeared onscreen; They were last seen in Josh Trank’s Fantastic 4 (stylized as Fant4stic) and Tim Story’s Fantastic Four films for Fox.

First Steps" has a thrilling ending that teases Dr. Doom and where the MCU goes from here in "Avengers: Doomsday."

But there was a very simple way for the MCU to reboot its thirst traps in The Fantastic Four: First Steps. And Pedro Pascal didn't even need to go shirtless for it. He would have simply needed to unbutton a bit.

First Steps" introduced the most powerful being in the MCU -Franklin Richards – and was pretty nonchalant about it.

So does RDJ’s Doctor Doom pop up in the new Fantastic Four movie? Well, sort of.

Production designer Kasra Farahani took that and ran with it, turning London’s Pinewood Studios into a retro-futuristic Manhattan by drawing influences from Stanley Kubrick’s “2001: A Space Odyssey” and architects including Eero Saarinen and Oscar Niemeyer.