Primer (movie)
But, Aaron had found out about this failsafe box and used it to try to get control of the timelines for both of them. Meeting at a park bench, Aaron shows Abe that he has been using a recording to say their conversation from an earlier time to fool him. Aaron says he fought and was drugged by an earlier double (or copy) of himself, who used the failsafe to come back and make the recordings. This Aaron wants to travel back in time to undo the events of a party. A party crasher had tried to shoot Rachel Granger. Abe agrees to try to change the events of the party with Aaron. The two succeed, but it is not clear how many times of travelling back it takes.