- With their 400-day mission simulation nearing completion, 4 astronauts begin to feel something's amiss.
- "400 Days" centers on four astronauts sent on a simulated mission to a distant planet to test the psychological effects of deep space travel. Locked away for 400 days, the crew's mental state begins to deteriorate when they lose all communication with the outside world. Forced to exit the ship, they discover that this mission may not have been a simulation after all.—ThresholdDweller
- The astronauts Theo, Emily, Dvorak and Bug are locked in an underground facility imitating a spaceship for 400 days simulating the travel to a distant planet. The intent is to study the psychological effect caused by the long isolation period without contact or communication with the outside world. They experience hallucinations and weird noises on the outside and close to the day 400, they see a stranger in their ship. When the man flees, Theo and Bug leave the facility and they find outside world dusty, dark and desolate. They decide to walk to seek somebody and while Dvorak believes it is part of the experiment, Theo, Emily and Bug believe that something bad may happen on Earth.—Claudio Carvalho, Rio de Janeiro, Brazil
- Four astronauts - Captain Theo Cooper, Dr. Emily McTier, Bug Kieslowski, and Cole Dvorak - begin a 400-day-long simulation on Earth intended to study the long-term effects of space travel.
As their time underground grinds on, the crew begins to deal with extreme psychological effects like paranoia and hallucination. The team settles deeper into their separate spaces, until a disheveled man finds his way into their simulated space ship. After his escape, the crew decides to exit and explore the surface world, which they discover is now dark, windy, desolate, forbidding, and covered with dust.
After a long walk with minor incidents, they discover the town "Tranquillity", which is inhabited and has electricity. A man named Zell invites them into his diner and tells them the moon had been struck by something which created an enormous dust cloud now covering the Earth, blocking the sun.
Dvorak scoffs at this suggestion, still believing they are in a simulation, and leaves to go to the local bar, followed by the rest of the crew. After a few drinks, Dvorak leaves the bar with a young woman without telling the others. The other three return to the diner, where Zell has offered them a place to sleep.
Bug takes first watch duty and soon begins hallucinating that he follows his son Sam but stomps across Zell, where the scene ends. Soon, McTier and Cooper wake up alone. When they ask Zell about their missing friends, he insists that Cooper and McTier arrived alone. Suspecting danger, the pair leaves the diner and unsuccessfully looks for their friends.
The pair returns to the ship and, as Cooper closes the entrance hatch, he discovers that they were being followed by Zell and two other men. Cooper and McTier manage to neutralize their attackers.
The very moment Zell dies, the 400 days have just passed, and they are informed that the simulation has ended with great success. The entrance hatch opens, and bright light shines down. Cooper and McTier grab each other's hands and anxiously await what happens next, but the film ends without showing that.
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