Ranked #36 of 40 in Season 4•−0.7 vs season avg
When Timmy insists on going to a blasting site despite Lassie's protests, she is struck on the head by a dynamite-propelled rock and appears to not know who she is. Then she wanders away from the farm.
Jon Provost
Timmy Martin
Hugh Reilly
Paul Martin
George Cleveland
George 'Gramps' Miller
Josh Albee
Mike Bishop
Tommy Rettig
Jeff Miller
Philip Ford
Director
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"Concussion" is episode 27 of Lassie season 4. It scored 5.8/10 from 22 votes, ranking #36 of 40 episodes this season (season average 6.5). Directed by Philip Ford, it aired on March 9, 1958.