Silent Running
After the entire flora goes extinct, ecologist Lowell maintains a greenhouse aboard a space station for the future with his android companions. However, he rebels after being ordered to destroy the greenhouse in favor of carrying cargo, a decision that puts him at odds with everyone but his mechanical companions.
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Silent Running (1972) is a adventure movie. Starring Bruce Dern, Cliff Potts, Ron Rifkin. Rated 6.4/10 on TMDB. Watch it online free on ZapFlix.