Ranked #17 of 30 in Season 8•−0.2 vs season avg
One stormy night while Steve is in San Francisco, Katie is alone in the Douglas house while the rest of the family is attending a ballgame. Her tenseness builds as late in the night she hears a scary rythmic noise, and hysterically calls Steve
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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"The Heartbeat" is episode 11 of My Three Sons season 8. It scored 7.2/10 from 63 votes, ranking #17 of 30 episodes this season (season average 7.4). Directed by Frederick de Cordova, it aired on November 18, 1967.