A man accidentally gets into a time machine and travels back in time nearly an hour. Finding himself will be the first of a series of disasters of unforeseeable consequences.
Hector is an ordinary man who's moving to a new house with his wife. One evening, while he's looking through his binoculars, he sees a naked girl in the woods. He decides to go there just to find that same girl laying on a rock. Suddenly, a man with a pink bandage covering his face, stabs Hector in his arm with scissors...—Javi Aldereguia
Héctor (Karra Elejalde) is a middle-aged ordinary man who has just moved to a lonely house with his wife Clara (Candela Fernández). They lead a quiet life. He receives a phone call, but the person doesn't say anything. Héctor calls that person back, but nobody answers.
Later Héctor is looking through his binoculars; he sees what he believes to be a naked girl in the woods. He decides to go there just to find that same girl (Bárbara Goenaga) lying on a rock. He clumsily falls close to the girl, and he realizes she's dead. Suddenly, a man with a pink bandage covering his face stabs Héctor in his arm with some scissors. A chase starts, and Héctor breaks into a house near the forest. There is strange machinery and equations on some blackboards within the house. He talks to somebody in a building nearby, and that person promises to get in touch with him immediately. The other man says that the man with the bandaged face is approaching him. The voice leads him to the other building through a path in the grass illuminated by many lights. Héctor sees more machinery and wonders aloud what all that is for. This is the time machine. Through the window, Héctor can see the car - driven by the man with the bandaged face. The other man tells him to get inside the machine and gets into the time machine and travels an hour back in time.
The young man in charge of the time machine, El Joven, (Nacho Vigalondo) does not recognize Héctor. The young man explains to Hector (Héctor 2) that he must not interfere with the other Héctor (Héctor 1) so he can go into the time machine again, leaving one Héctor instead of two. Héctor can't help but phone his home, worried that Clara is with "a different man". However, he doesn't dare say anything, this causes him to realize that the phone call he received earlier in the morning was from himself. El Joven tells Héctor 2 off, but things still happened as they should have. Héctor 2 tries to avoid temptation and not phone his wife again. Héctor 2 leaves with the young man's car and stops when he sees the young lady riding her bike to the village nearby. A van smashes into Héctor 2's car and he uses the bandages on his wounded arm to bandage his now injured face. The bandage stops the bleeding but it turns pink because of the blood. The young lady asks him whether he's all right, and promises to call for an ambulance. Although her mobile phone doesn't have coverage, Héctor 2 doesn't want her to leave. She is a hairdresser, and fixes Héctor 2's bandages. Héctor 2 steals the girl's scissors, and asks for her help in order to do something. Héctor 2 sees Héctor 1 looking through the binoculars. Then Héctor 2 realizes he has to stab Héctor 1 and chase him to the time machine. The girl runs away and Héctor 2 runs after her. Héctor 2 forces her to repeat the movements which Héctor 1 saw. Héctor 2 sees how Clara caresses Héctor 1, and he rudely demands that the girl takes her trousers off. He chases her, and they both fall down an uneven slope in the wood. The girl appears to be dead. Héctor 2 undresses her completely, and leaves her for dead. After he arrives, Héctor 2 approaches Héctor 1 and stabs him and chases after him, recreating the movements he saw before.
Héctor 2 stops to breathe and calm down, when he hears a scream - a female voice. Héctor 2 returns to his own home where he listens to the telephone, hears strange music and is attacked by somebody who thrusts a wooden table into his face. He heads towards the roof of his house and apparently witnesses his wife's death, after she falls off the roof. Héctor 2 takes his wife's car and runs after Héctor 1, following the path of lights.
Héctor 2 returns to the time machine and asks the young man to bring him back to the past a few seconds earlier than the last time (becoming Héctor 3). El Joven claims that he cannot as using the machine takes up a lot of energy, but Héctor notices that one of the batteries for machine is missing. He threatens Joven into admitting that he threw the battery outside and goes with him to find it with a flashlight. While they are searching for the battery, Héctor realizes that Joven had been lying to him about his motives as he had removed the battery before he had arrived at the lab. Héctor forces Joven to admit that he had been taking orders from another Héctor who he dubs Héctor 3, who had been hiding in the lab, when he (Héctor 2) had time traveled for the first time. Héctor 3 told him to prevent Héctor 2 from time traveling again, which explains why he removed the battery from the Time Machine in the first place. But Héctor causes Joven to realize that he had already traveled back in time and became Héctor 3. Joven finally agrees to send him back into the past.
After he arrives he tells the past version of Joven to keep quiet and wait for Héctor 2 to arrive. He hides and witnesses his past self arrive via the Time Machine and tells Joven to help him and make sure everything happens as he remembered and accompanies Héctor 2 through his journey. This leads to him hitting Héctor 2 with the young man's orange truck, so that Héctor 2 can become the man with the pink bandage and go after Héctor 1.
In turn, Héctor 3 suffers a car accident. He sees the young girl and scares her, as she was already running from Héctor 2. Héctor 3 says that he's also running from the man with the bandages. After a short sleep, the girl takes Héctor 3 to his own house, not knowing it's his, as it's the only inhabited place nearby. Héctor 3 says it's not a good idea, but they enter the house. Héctor 3 is left, and the girl leaves. Clara sees Héctor 3's disfigured face. Clara says she's already phoned the police. Héctor 3 tries to hide Clara within a room, trying to avoid her death. He also places the ladder in the right place to enter the house by the top floor's window, while bandaged Héctor 2 is going up the stairs. Héctor 3 throws a wooden table to Héctor 2, who falls down the stairs. Héctor 3 dresses the girl with a red coat and cuts her hair, so that "Héctor 2" would think that's his wife. Héctor leads her up the ladder to the roof and takes his wife outside to rest on some chairs, they listen as Héctor 2 encounters the girl and witness her death, leading him to go to lab and become Héctor 3.
The girl dies instead of Héctor's wife, while Héctor 3 has convinced Clara to stay with him. The film ends with Hector 3 and his wife waiting for the police to come. Héctor 2 drives away as the sirens of the police are heard getting closer and closer. Héctor rests satisfied as he is the only Héctor left in the present and had succeeded in saving his wife.
