Lassie - Season 4 - Eps 15: The Bike
Timmy borrows a bike to learn to ride, but when the bike is stolen, he must replace the stolen one with his new bicycle. The situation is resolved when Lassie plays detective to hunt down the bike thief.
About Lassie

Title: Lassie
First Air Date: 1954-09-12
Last Air Date: 1973-03-24
Status: Ended
Rating: 6.1/10 (from 64 votes)
Language: EN
Seasons: 20
Total Episodes: 591
Network: CBS
Genres: Action & Adventure, Drama, Family, Comedy
Production Companies: Unknown
Synopsis
Lassie is the pet of Jeff Miller, an 11-year-old farm boy. The two become best friends and enjoy family adventures in the American countryside, teaching each other about love, nature and commitment.
Cast

Hugh Reilly
Paul Martin

Josh Albee