Divorced scientist Nick turned his back on everyone to one day achieve time travel. Now, with a chance to prove his finished time machine works, he and failed physicist Dr. Kent hold their breath as they initiate launch from Nick's basement, only to find the house loses power. Suddenly a man comes downstairs: it's a younger version of Nick. Without thinking, they conk him over the head with a wrench and confirm it's the year 2012. However, to have any chance at returning to an unaltered present, Nick must fill his younger shoes and repeat the events of the night - but he quickly discovers it's the night of his engagement party - surrounded by the friends he's neglected - proposing to Jess, the woman he just divorced.