An Avengers 4 rumor says that Captain America will lift Thor’s hammer (Mjolnir) IF time travel happens in Avengers 4. However, as we’ve seen in Avengers Age of Ultron, Captain America was not worthy enough to lift Mjolnir. Today I’m going to explain my original theory as to why Captain America will now be able to lift Thor’s hammer in Avengers 4 (if the rumor ends up being true.)