The Flintstones - Season 1 - Eps 21: Love Letters on the Rocks
Jealous Fred's discovery of a love poem that was sent to Wilma prompts him to hire Bedrock's top detective Perry Gunite, to find out who the home-wrecking poet is. Gunite's investigation mistakenly points to Barney. Fred plans revenge against his friend until Wilma reminds her husband that he had written the poem himself years earlier during their courtship.
About The Flintstones

Title: The Flintstones
First Air Date: 1960-09-30
Last Air Date: 1966-04-01
Status: Ended
Rating: 7.409/10 (from 910 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)