Star Trek IV: The Voyage Home
When a huge alien probe enters the galaxy and begins to vaporize Earth's oceans, Kirk and his crew must travel back in time in order to bring back whales and save the planet.
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Star Trek IV: The Voyage Home (1986) is a adventure, sci-fi movie running 1h 58m. Starring William Shatner, Leonard Nimoy, DeForest Kelley. Rated 7.2/10 on TMDB. Watch it online free on ZapFlix.