So I went into this film expecting it to be really bad and I had a joke around it being so bad they called it "ass" twice. However the film was OK.
Jeremy's Iron, wearing a jumper his Nan knitted, is given 3 billion dollars by the Templars to find an apple. Fassbender plays a parkour-loving hoodie rogue who knows where it is but he doesn't know it. He's fastened to a robot arm that taps into his DNA to help him remember.
It probably makes no sense to people not familiar with the games.