Note: Be aware there are spoilers for “The Fantastic Four: First Steps” in the article below.

First Steps. In a mid-credits scene he was seen allowing Sue and Richard's son Franklin Richards touching his face. But what is the larger impact of this scene leading up to Avengers Doomsday?

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).