The Fantastic Four: First Steps has finally arrived, and it ushers in a new era for the MCU: Marvel Phase 6. Marvel movies are known to be loaded with cameos and Easter eggs, and the Fantastic Four digs up some lesser-known adversaries from the comics that you may or may not have heard of.

Marvel's First Family is finally part of the MCU with "The Fantastic Four: First Steps," and they have a truly storied history. But that might make you worry that you have a lot of homework to do before seeing the film.