It's anyone's guess as to who could next portray the Fantastic Four, but a new fan-made poster has brought a pretty prominent fancast to life. Twitter user UberKryptonian recently shared a fan poster on their Twitter account, which imagines John Krasinski as Reed Richards/Mr. Fantastic. I would love that," Krasinski said in an interview earlier this year. "I mean listen, I?m still getting into the whole superhero thing.