Xtro (1982)

Tony's father Sam, abducted by aliens three years earlier, returns to earth and seeks out his wife and son, but Rachel has since been living with Joe and the reunion is awkward. Joe doesn't trust Sam, and Rachel can't quite decide what her feelings are for her two men. Sam is not the same as when he left, and he begins affecting Tony in frightening ways.

Passed uncut for cinema. Xtro was on the Section 3 Nasties List and was liable for seizure and forfeiture by the police. Also passed uncut for video in 1987. Downgraded to an uncut 15 certificate in 2007.