The two main characters in the Fantastic Four, Reed Richards aka Doctor Fantastic and Susan Storm aka Invisible Woman's son Franklin Richards are said to be one of the most powerful mutants of all time. This ability is fully developed in him from childhood. Franklin is immortal as well as changing the current reality. The little boy is so strong that he once created a whole universe in his own pocket. Only with the power of thought can Franklin wipe Thanos out of the world. It goes without saying that this character is not likely to be seen in the Marvel Cinematic Universe at the moment due to the complexity of the situation.
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