The Flintstones - Season 6 - Eps 20: Curtain Call at Bedrock
Fred refuses to play the lead in the PTA show, ""Romeorock and Julietstone,"" opposite Wilma, so she casts Barney instead. Feigning the mumps, Barney (who is terrible in the part) drops out, forcing Fred to take over. But then laryngitis causes Wilma to drop out, so Barney rushes back in, now playing Julietstone!
About The Flintstones

Title: The Flintstones
First Air Date: 1960-09-30
Last Air Date: 1966-04-01
Status: Ended
Rating: 7.427/10 (from 924 votes)
Language: EN
Seasons: 7
Total Episodes: 166
Network: ABC
Genres: Family, Animation, Comedy, Kids
Production Companies: Hanna-Barbera Productions, Screen Gems Television
Synopsis
The misadventures of two modern-day Stone Age families, the Flintstones and the Rubbles.
Cast

Alan Reed
Fred Flintstone (voice)

Mel Blanc
Barney Rubble (voice)

Jean Vander Pyl
Wilma Flintstone (voice)

Gerry Johnson
Betty Rubble (voice)

Don Messick
Bamm-Bamm Rubble (voice)