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Moon

After an oil crisis, Lunar Industries makes a fortune by building Sarang Station, a facility on the far side of the Moon to mine the alternative fuel helium-3. The facility requires only one human to maintain operations and launch canisters bound for Earth containing helium-3. Samuel Bell has two weeks before ending his three-year work contract there. Chronic communication problems have disabled all live communications with Earth and limit him to occasional recorded messages from his wife Tess, who was pregnant with their daughter Eve when he left.

Sam begins to suffer from hallucinations of a teenage girl and a disheveled man. One such image distracts him while he is out recovering a canister, causing him to crash his rover and fall unconscious.

Sam awakes in the base infirmary with no memory of the accident. He overhears GERTY, an artificial intelligence which assists him, having a live chat with Lunar Industries management, despite the apparent communications failure. Lunar Industries orders Sam to remain on base and says that a rescue team will arrive for repairs. Suspicious, Sam fakes an emergency to persuade GERTY to let him outside. He travels to the crashed rover and finds his unconscious doppelganger. He takes the double back to the base, and GERTY tends to his injuries. The two Sams start to wonder if one of them is a clone of the other. After an argument and physical altercation, GERTY reveals that they are both clones of the original Sam Bell. GERTY activated the newest clone after the crash and convinced him that he was at the beginning of his three-year contract. His memories of his wife and daughter are implanted.

The two Sams search the area, finding a communications substation beyond the facility's perimeter which has been interfering with the live feed from Earth. GERTY helps the older Sam access the recorded logs of past clones, who all fell ill as their contract expired, and he realizes that he is headed towards a similar fate, having already started to experience symptoms. Later, the older Sam discovers a secret vault containing hundreds of hibernating clones. Lunar Industries is using clones of the original Sam Bell to avoid the cost of training and transporting new astronauts, as well as deliberately jamming the live feed to prevent the clones from contacting Earth; clones, who believe they are entering hibernation at the end of their contract before their final return to Earth, are actually incinerated. The older Sam drives past the interference radius in another rover and tries to call Tess on Earth. He instead makes contact with Eve, now 15 years old, who says that Tess died years before. He hangs up when Eve tells her father on Earth that someone is calling regarding Tess. Returning, the older Sam's physical deterioration worsens.

The two Sams realize that the incoming rescue team will kill them both if they are found together. The newer Sam convinces GERTY to wake another clone, planning to leave the awakened clone in the crashed rover and send the older Sam to Earth in one of the helium-3 transports. However, the older Sam, having learned that the clones break down at the end of the 3-year contract, knows that he will not live much longer. With his health declining, the older Sam suggests that he be placed back into the crashed rover to die so that Lunar Industries will not suspect anything, while the newer Sam escapes.

Following GERTY's advice, the newer Sam reboots GERTY to wipe its records of the events. Before leaving, the newer clone reprograms a harvester to crash and wreck the jamming antenna, thereby enabling live communications with Earth; he also takes a helium-3 canister with him to Earth. The older Sam, back in the crippled rover, remains conscious long enough to watch the launch of the transport carrying the newer Sam. The rescue team is fooled after finding both a newly-awakened clone in the medical bay and the corpse of the older Sam inside the crashed rover.