Primer (2004) is a science fiction drama that follows two engineers who accidentally invent a time machine. After stumbling upon their invention, the two must grapple with the ethical and moral implications of their newfound power. As they explore the possibilities of time travel, they must also confront the consequences of
From Wikipedia
Primer is a 2004 American independent science fiction film written, directed, produced, edited, and scored by Shane Carruth in his feature debut. The film stars Carruth and David Sullivan, and depicts the events surrounding the accidental discovery of time travel.