Duncan Jones, who pulled off a no-budget sci-fi wonder with last year's Moon, returns with this tricky thriller. Jake Gyllenhaal is a soldier who wakes up in the body of an unknown man and learns that he's got just eight minutes to prevent a terrorist from blowing up a train. He fails. Repeatedly. Groundhog Day-style. Eventually, he decides to spend his time saving one cute commuter (Michelle Monaghan). 93 minutes PG-13.