Ranked #23 of 28 in Season 9•−0.4 vs season avg
Ernie bemoans the task of writing in Spanish to a Latin-American pen pal but she then astonishes him by accepting a dinner invitation by cablegram; Maria is the daughter of a high ranking diplomat.
Fred MacMurray
Steve Douglas
Don Grady
Robbie Douglas
Stanley Livingston
Chip Douglas
Barry Livingston
Ernie Thompson
William Demarest
Charley O'Casey
Tina Cole
Katie
Frederick de Cordova
Director
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"Ernie's Pen Pal" is episode 23 of My Three Sons season 9. It scored 6.8/10 from 51 votes, ranking #23 of 28 episodes this season (season average 7.2). Directed by Frederick de Cordova, it aired on March 8, 1969.