It may not be unusual for a filmmaker to make a documentary about his father. But when your father is the creator of “The Rocky Horror Show” and its cult film adaptation, things are a little bit different. For Linus O’Brien, he’s struck gold with “Strange Journey: The Story of Rocky Horror,” a moving tribute to his father Richard O’Brien’s creation, the musical that became a cult favorite in cinemas for 50 years. It remains the longest-running theatrical cinema release in the world. To celebrate its anniversary, O’Brien (Yes, he’s named after the Peanuts character) interviews his father, and nearly all the living cast and lead crew members.

Richard O’Brien and Tim Curry during the musical’s run in London in 1973. (photo: Margo Station)   Unlike some documentaries on the film from previou

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