Primer (2004) Published Date  :  December 19, 2017

Itellectual engineers Aaron (Shane Carruth) and Abe (David Sullivan) build and sell error-checking technology with the help of their friends Robert (Casey Gooden) and Phillip (Anand Upadhyaya). But when Aaron and Abe accidentally invent what they think is a time machine

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The two heroes accidentally create a small “box” that causes time-travel, although they don’t know it.

One of the curiosity – Abe – goes off on his own and makes a time-travel box big enough for a person.

He travels backward to the start of his day.

He drives off, grabs buddy Aaron, and he shows Aaron himself (from 3) going into the box.

They have two boxes now, and they travel back to the beginning of their day.

They do this a few times with some success, gaming stocks to make money.

Aaron’s wife complains about the sound of rats in the attic.

Aaron takes a call from his wife during the day, uses the box at night, goes back to the beginning of the day, then takes the call again, beating “himself” to the punch, proving that time-travel is not a closed loop. Things can be changed.

They see a man they know named Granger who looks disheveled; they call his house and he’s there. So at some point, Granger will use the box, go to the past, and pop out in the state he’s in now.

Abe, unhappy with these complications, heads to a secret time-travel box he’s made called the “failsafe,” which takes him back to the day he told Aaron about time-travel (see 4).

He has to drug his original self so he can “replay” the days without that original intervening.

He goes back, sees Aaron with an earpiece, and collapses.

When he comes to, it’s revealed that Aaron learned about Abe’s failsafe a while ago, stole it away and replaced it with a different failsafe (one that starts a little bit later).

Aaron’s since gone back in time, drugged his original self, stuck his original self in his own attic (see 7), and “replayed” the events of the film.

Aaron tries to go back in time and drug himself again, but he’s too weak, and his original self fights him off. At this point, there are three Aarons in the film – the original, the one who drugged the original, and the one who failed to drug the last one.

The original drugged Aaron breaks out, the second one flees the country to build a bigger time machine, and the third one stays in town to continue as Aaron proper.

The drugged Abe busts out about the same time his newer self vows to find a way to prevent them from ever discovering time-travel. Of course, he can’t, because he’ll never be able to go as far back as Aaron can, because of that failsafe switcheroo.