Hollyrock star Shades Stone moves to Bedrock, impressing Fred and Betty, but not Wilma and Barney. Shades takes advantage of Fred and Betty and the other youngsters in Bedrock. Wilma ignores him, but when Fred decides Shades is his new best friend, Barney runs away to the local swamp. A teenage Godzilla-type monster named Billy is under pressure from his family to be destructive, but he bears no hatred towards cavepeople. Captain Caveman and Cavey help the boy monster by getting him to tear down some old buildings slated for demolition.