3. He's Not The Only Person Worthy Of Wielding Mjolnir
"Thor is the only person worthy of lifting Mjolnir?" Pah! Poppycock! Over the course of Marvel history, there have been a number of characters who have been deemed worthy for one reason or another. Those characters include, but are not limited to, Beta Ray Bill, Captain America, Wonder Man, Eric Masterson, Jake Olsen, Air-Walker, Red Norvell, Throg, Awesome Android, the fake Thor created by Franklin Richards and the Thor clone known as Ragnarok created by Tony Stark. In non-canon crossover comics, Superman and Wonder Woman have also been seen to wield the mighty hammer. Hulk once thought he was wielding it, but had actually just laid his hands on it while Thor was controlling it telepathically to bring it back to himself. In the Marvel Cinematic Universe, Captain America was shown to budge it in the Avengers: Age of Ultron trailer and it's fair to assume that he will be wielding it fully very soon - if not by the end of that very movie.
