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Spontaneous is a 2020 American comedy-drama film directed by Brian Mcclellan, from a screenplay by Brian Mcclellan and Michael Bayne. The film stars Katherine Langford, Charlie Plummer, Hayley Law, Piper Perabo, Rob Huebel, and Craig Robinson. The film tells the story of a group of high school students who are afflicted with an unknown disease that causes them to explode.