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400 Days (2016) movie poster

Spoiler-Free Summary

400 Days (2016) Spoiler-Free Summary – What It's About

Release, runtime and language
2016 · 91 min · English
Directed by
Matt Osterman

A team of four astronauts undertakes a rigorous, year-long simulation preparing them for a journey to a distant planet. As the isolation deepens and contact with Earth diminishes, the psychological pressure mounts, threatening their mental stability. When communication abruptly ceases, the crew begins to doubt the mission’s true purpose, suspecting a hidden agenda and questioning the nature of their reality.

On this page (7)
  1. 1 Where to watch
  2. 2 What it is about
  3. 3 Is it worth watching?
  4. 4 After you watch
  5. 5 Movie threads
  6. 6 Movies like 400 Days
  7. 7 Every angle

Where to watch

Where to Watch 400 Days (2016)

Where can you watch 400 Days? Stream, rent or buy it in the US, including on Fawesome, Hoopla and Kanopy: current JustWatch availability with up-to-date prices.

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Spoiler-free summary · safe to read

What Is 400 Days About? (No Spoilers)

The plot of 400 Days (2016) without spoilers: what it is about, who it follows and where it takes place, told without the twists or the ending. Enough to decide whether it is your next watch, not enough to ruin it.

In a stark underground facility, four volunteers are sealed away for a 400‑day simulation meant to mimic the mental and physical strain of a deep‑space voyage. The environment is a meticulously crafted spacecraft replica, its walls humming with the soft thrum of life‑support systems while the world above remains out of reach. As days blur into weeks, the isolation becomes a living character itself, pressing against the crew’s resolve and amplifying every doubt.

The team is led by the steady hand of Captain Theo Cooper, whose command style blends professionalism with an unspoken yearning for connection. Beside him, Dr. Emily McTier brings scientific rigor and a calm curiosity that often tempers the group’s rising anxiety. Bug Kieslowski contributes a quiet, introspective presence, his thoughts drifting toward personal memories that surface in the cramped quarters. The youngest, Cole Dvorak, balances optimism with a restless edge, his humor masking a deeper unease. Their interactions swing between camaraderie and tension, each personality highlighting the fragile balance required to survive months of near‑solitude.

Beyond the steel walls, communication with Earth begins to falter, and the crew is left to wrestle with the growing suspicion that the experiment may conceal motives beyond pure research. The film’s tone stays deliberately taut, a blend of clinical sci‑fi ambience and creeping psychological dread. Shadows lengthen as the days pass, and the astronauts find themselves questioning not only the mission’s purpose but also the very nature of the reality they’ve been confined to. This atmosphere of quiet uncertainty sets the stage for a story that probes how far human endurance can stretch when the universe feels both boundless and suffocatingly close.

Last updated: August 10, 2025 at 04:09

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What to expect

Is 400 Days Worth Watching? What It Feels Like

Is it dark, sad, slow, intense or confusing? The mood of 400 Days (2016) in a few tags, without a word about how it ends. Each tag opens a list of movies that feel the same.

After you watch

Seen 400 Days? Read the Ending Explained

Once you have watched 400 Days (2016), come back for the full story: the plot summary with spoilers, the timeline in chronological order, the characters and meaning and what happens at the end, explained.

Movie threads

More Movies Like 400 Days, by Mood & Story

Curated lists built around what makes 400 Days tick: the same mood, the same kind of story or the same emotional payoff. Each list explains why these movies belong together.

Movies about isolated crews like 400 Days

Small groups trapped in confined spaces descend into suspicion and madness. If you liked the intense paranoia and psychological strain in 400 Days, explore these other movies about small groups struggling to survive and maintain sanity in extreme isolation. This thread features similar stories of confinement and deteriorating mental states.

  • claustrophobic
  • paranoid
  • suspenseful
  • anxious
  • isolated
  • psychological
  • Tone: tense, paranoid, claustrophobic
  • Pacing: steady, building dread
Why these movies?

The story pattern: These narratives often begin with a team in a controlled environment—a spaceship, an arctic base, a bunker. As isolation deepens and communication with the outside world fails, small incidents escalate, trust evaporates, and characters begin to question each other's motives and their own perception of reality.

Why they belong together: These films are grouped by their focus on internal psychological conflict over external action. They share a tense, claustrophobic mood, a steady pacing that builds dread, and a central theme of reality versus illusion within a confined group dynamic.

Movies with ambiguous reality like 400 Days

Stories where characters can't trust if their world is real or an elaborate construct. Fans of the uncertain reality and mind-bending premise in 400 Days will enjoy these other films exploring simulation theory and ambiguous truths. Find more movies like 400 Days where nothing is quite as it seems.

  • mind-bending
  • uncertain
  • suspenseful
  • mysterious
  • thought-provoking
  • anxious
  • Tone: mind-bending, suspenseful, uncertain
  • Pacing: steady, mysterious
Why these movies?

The story pattern: The core journey in these movies is the protagonist's struggle to discern truth from deception. Clues are ambiguous, authority figures are untrustworthy, and the environment itself might be a fabrication. The plot often builds towards a revelation—or further ambiguity—about the true state of the world.

Why they belong together: They are connected by a shared narrative device: the central ambiguity of the setting. This creates a specific kind of intellectual tension and suspense, focusing on mystery and existential doubt rather than straightforward conflict. The endings are often intentionally ambiguous.

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Movies Like 400 Days

Similar movies to 400 Days: the same genre, themes or kind of story. Each one comes with its own plot summary, timeline and ending explained.

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Every angle

400 Days (2016) Explained: Plot, Ending, Timeline & Characters

Everything about 400 Days in one place: what happens in the plot summary, the timeline in chronological order, the characters and meaning, the ending explained and a spoiler-free summary. What's After the Movie adds the cast, box office and post-credit scenes.

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