The Flintstones Season: 1, Episode: 6

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A Hollyrock film company goes on location in Bedrock to film its new feature Monster From The Tar Pits, and gullible Fred is enlisted as stand-in for star Gary Granite. But Fred's real problems begin when Wilma and Betty audition for roles in the film and end up going ga-ga upon meeting movie stars Rock Pile and Wednesday Tuesday.