It Conquered the World overview

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Synopsis:

Though Roger Corman was still new to sci-fi in 1956, he made up for lost time with the above-average quickie It Conquered the World. Peter Graves heads the cast as Paul Nelson, who suspects that his best friend, eccentric genius Tom Anderson (Lee Van Cleef), is up to no good. Sure enough, Tom has contacted the denizens of the planet Venus, who hope to exploit Tom's weak nature in order to take over the world. Before long, the Venusians have taken over the minds and bodies of virtually all of Tom's friends and loved ones.