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.

The Fantastic Four reveals why Galactus wants Franklin Richards and his true power might tie into Doctor Doom's endgame.

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).

These villains could challenge Marvel's first family in new and exciting ways not yet shown on the big screen.

Robert Downey Jr's Doctor Doom's motivation for potentially going after Marvel's first family might boil down to Franklin Richards' powers.