Primer is a 2004 American science fiction drama film about the accidental discovery of a means of time travel. The film was written, directed, and produced by Shane Carruth and was completed on a budget of $7,000. Carruth graduated from college with a degree in mathematics and is a former engineer. Primer is of note for its extremely low budget, experimental plot structure, philosophical implications, and complex technical dialogue, which Carruth chose not to simplify for the sake of his audience. One reviewer said that "anybody who claims he fully understands what's going on in Primer after seeing it just once is either a savant or a liar." The film collected the Grand Jury Prize at Sundance in 2004 before securing a limited release in US cinemas, and has since gained a cult following. Four engineers—Aaron (Shane Carruth), Abe (David Sullivan), Robert, and Phillip—who work for a large corporation during the day, run a side business from Aaron's garage at night, building and selling...