Movie star Mimi Marlowe has car trouble near ... Lassie and the fireman must rescue them before the mine fills with gas. Timmy bets Lassie's new jeweled collar that she can beat a friend's new ...

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 ...