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Jon Provost
Known for: ActingJonathan Bion Provost is an American actor, best known for his role as young Timmy Martin in the CBS series Lassie. Wikipedia
Filmography 11
The New Lassie
as Steve McCullough 
The Computer Wore Tennis Shoes
+2
as Bradley 
All Mine to Give
as Robbie Eunson - age 6 
Back from Eternity
+1
as Tommy Malone 
Lassie: Disappearance
as Timmy Martin 
Lassie's Great Adventure
as Timmy Martin 
Colonials
+1
as Spark (voice) 
The Story of Lassie
as Self 
Lassie: The Wayfarers
as Timmy Martin