Dark Star
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In the far reaches of space, a small crew, 20 years into their solitary mission, find things beginning to go hilariously wrong.

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Dark Star is a 1974 American science fiction comedy film produced, scored and directed by John Carpenter and co-written with Dan O’Bannon. It follows the crew of the deteriorating starship Dark Star, twenty years into their mission to destroy unstable planets that might threaten future colonization of other planets.

https://en.wikipedia.org/wiki/Dark_Star_(film)