"The story takes place in 1988 in the town of Middlesex, Virginia,[1] during the time of the United States presidential election. Donnie Darko is an intelligent and emotionally troubled teenager who sleepwalks, experiences visual hallucinations (possibly because of his paranoid schizophrenia for which he takes medication), and is in the medical care of a psychiatrist. One night, a jet engine from a commercial aircraft falls into Donnie's bedroom. He avoids death only because prior to the accident, he had obeyed a voice in his head that led him to sleepwalk outside of his room. The voice is that of Frank, an apparently imaginary friend in a man-sized rabbit costume. At midnight on October 2, Frank prophesies to Donnie that the end of the world will occur in 28 days, 6 hours, 42 minutes and 12 seconds.
Later, Donnie begins seeing "silvery plastic gel" spears[2] that flow out from people's chests. Such a spear indicates where a person will travel in the near future. In one example, Donnie sees one spear snake into the room, followed by his younger sister skipping through the room. Another spear leads Donnie to a pistol in his parents' closet, which he takes and keeps.
Meanwhile, Frank instructs Donnie to perform acts which provoke certain chains of events:
- Donnie is instructed to flood his high school, which ends up giving him the opportunity to court his new classmate, Gretchen Ross.
- Donnie is intrigued by Frank to pursue the question of time travel, so he starts a conversation with his science teacher. The teacher gives him the book The Philosophy of Time Travel by Roberta Sparrow, an old woman known as "Grandma Death" among the neighborhood youth. The book explains the scenario that Donnie is going through.
- Donnie burns down the house of a motivational speaker he ridiculed at a school assembly, thereby exposing the speaker's secret "kiddie porn dungeon". The speaker's arrest begins a series of events that results in Donnie's mother chaperoning Donnie's younger sister and her dance group on a flight to Star Search in Los Angeles.
With both of their parents out of town, Donnie and his sister Elizabeth host a Halloween costume party on October 29, a day before the prophesied end of the world. At one point in the party, Donnie finds that the memo board on his refrigerator reads, "Frank was here, went to get beer." Gretchen turns up in a panic, as her mother has disappeared and she fears her stepfather has come to kill her. She and Donnie go up to his mother's room where they presumably have sex.
Later that night, Donnie, Gretchen and two other friends seek advice from Roberta Sparrow when they get ambushed by two school bullies who happen to be robbing the house that night. During the struggle, the bully asks, "why the fuck are you here?" to which Donnie proclaims "Deus ex Machina". Gretchen, having been pushed to the ground by the other bully, is run over and killed by a car swerving to miss Roberta Sparrow. The bullies flee. The car that killed Gretchen stops, and Donnie sees the driver as Frank in a rabbit costume for Halloween. Donnie uses his parents' pistol to shoot Frank in the eye, killing him. This was foreshadowed by earlier scenes in which Donnie stabs the mirror image of Frank in the right eye and when Frank removes his rabbit mask to reveal a gaping wound in his right eye.
Arriving home with Gretchen's body, Donnie spots a portal opening in the sky and drives to a hillside. Donnie's mother and sister experience turbulence on their return flight home; one of the airplane's jet engines detaches and falls. The engine travels through the time portal to 28 days earlier, crashes into Donnie's bedroom, completing the predestination paradox. This time, Donnie chooses to stay in bed (most likely to save the girlfriend he will never meet). Another reason he could have stayed in bed would be because he shot Frank in the eye and Frank was not able to save him this time. The ending is open to interpretation.
The story ends on the morning after the jet engine accident. Donnie is dead and the people his actions affected are stunned. Frank, while designing a ghastly rabbit costume, subconsciously touches his right eye. Gretchen is alive and rides by Donnie's house on her bicycle. Never having met Donnie, she talks with a neighborhood child about the sad accident. She waves somberly to Donnie's mother and they seem to share a vague sense of mutual recognition."
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