Dark Star
A group of scientists are sent on a mission to destroy unstable planets. Twenty years into their mission, they have to battle their alien mascot as well as a "sensitive" and intelligent bombing device that starts to question the meaning of its existence.
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Dark Star (1974) is a comedy, sci-fi movie running 1h 23m. Starring Brian Narelle, Cal Kuniholm, Dan O'Bannon. Rated 6.0/10 on TMDB. Watch it online free on ZapFlix.