Source Code: The One

Following whatever mystical bullshit that happens at the end Source Code, 2011's smash hit, comes Source Code: The One.  Jake Gyllenhaal returns in the hikacked-body of an unwitting teacher, only to be confronted by another Jake Gyllenhaal in another body!  He must learn to jump between dimensions in an attempt to prevent an evil version of himself from killing every instance of Jake throughout the Multiverse to gain ultimate power!  Oh, and the girlfriend he fought so hard to save in the original movie dies in the first twenty minutes.