Alright, so Jack from Titanic and Tom from 500 Days of Summer are hired by Ras Al' Ghoul's decoy from Batman Begins to break into Scarecrow's mind and make him decide to break up his dad's company, but he needs someone to make the dreams or something, so Jack asks Nigel Powers for help and he gives him Juno, and she's gonna do the building of something, and then they get Shizon from StarTrek Nemesis to shapeshift and stuff, and then like they're with the in a plane and a train, and in a bus, and a hotel with no gravity, and then on a mountain, and limbo pergetory, and Rachel Dawns Mk3 is trying to kill Jack and all kindsa shit happens.
tl;dr
Movie was a mindfuck.