When Worlds Collide
When a group of astronomers calculate a star is on a course to slam into Earth, a few days before, it's accompanying planet will first pass close enough to the Earth to cause havoc on land and sea. They set about building a rocket so a few selected individuals can escape to the planet.
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When Worlds Collide (1951) is a drama, sci-fi movie running 1h 23m. Starring Richard Derr, Barbara Rush, Peter Hansen. Rated 6.4/10 on TMDB. Watch it online free on ZapFlix.