While Reed Richards/Mr. Fantastic and Sue Storm/Invisible Woman's (Pedro Pascal, Vanessa Kirby) son Franklin Richards was at the centre of The Fantastic Four: First Steps' plot, Doctor Doom's appearance has left fans intrigued about the MCU character.

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.

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