Seasons & episodes

For a club project, Timmy and Boomer adopt a tree that was supposedly planted by Johnny Appleseed, then discover it is sleighted to be cut down to make way for a highway, so Timmy writes a letter to the President of the United States.

When Lassie keeps coming home with greasy muck on her legs, Timmy and Boomer investigate, and discover a pool of oil on their property. But Uncle Petrie's investigation of the pool proves to be his undoing.

Asa Winkler, a conniving handyman, claims Lassie bit him and tore his pants to obtain odd jobs at the Martins--and arranges other ""accidents"" to stay on.

A breeder says Lassie may be descended from a famous show dog and urges Timmy not to let her run wild, so she must sit on the sidelines while Boomer's terrier Mike has all the fun.

Timmy, disappointed that there are no contests in the county fair a small boy can participate in, enters his burro Lucky in a farm horse event.

The Martins adopt a cat they find half-drowned outside the house, but the conniving cat, dubbed ""Marmalade"" by Timmy because of his color, immediately starts getting Lassie into trouble.

Knowing Ruth hasn't had a new hat in four years, Paul buys her a lovely spring hat he discovers she was longing for, but Timmy and Lassie inadvertently ruin it while playing.

Timmy and Boomer are heartbroken when they find out Lassie's puppies are to be sold, so Lassie hides them in an old pen in the woods. But the mischevious babies get free.

The entire family pitches in to help Timmy win in his Cub Scout troop's kite-flying contest, especially after the original kite is lost.

Lassie, staying at a neighbor's house while the family as at the county fair, is blamed for the damage done by Chipper, a chimpanzee being nursed by Mrs. Collins.

Lassie falls in love with Suzy, a canine hand puppet manipulated by a down-on-his-luck ventriloquist.

Timmy and Boomer are convinced that their new neighbor is a bank robber.

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Timmy and Boomer heartily disagree over the methods and tasks involved in the construction of a lean to but learn to work together when the boys and Lassie must rescue Boomer's visiting cousin Millicent from a cave ledge.

Lassie befriends a stray dog and finds a rambunctious runaway show horse which, after Lassie trains the stray dog to be a stable mate, becomes more calm.

While helping Timmy get pictures for a photo contest Paul and Uncle Petrie comes across a uncooperative man hunting pheasants on the Martin property.

Timmy wants his school to participate in The Lone Ranger Peace Patrol program encouraging children to save their money to buy saving bonds to support the United States.

At the church carnival Timmy and Boomer dresses Lassie as a fortune teller but it does not goes as they planned.

An unprepared city boy who has after a quarrel run away from his uncle with whom he is visiting leads Timmy and Boomer who are camping out in the Martin barn into danger in the woods.

When Boomer goes on an overnight visit, Mike who has been left in Timmy's care becomes shut in the trunk of the Martin's car while chasing his ball and taken to a garage where a fire starts.

Ruth loves her new refrigerator, but Lassie prefers meals from the old icebox instead--precipitating a battle of wills.

Timmy buys an old plowhorse for a dollar, but Paul says they cannot keep the animal since he can't do any work. In trying earn money to keep the horse, Timmy becomes trapped in a mine.

Timmy enters a ""why I love my pet"" contest and entrusts Lassie to get the entry to the mailman on time, but she spends so much time aiding neighbors in trouble that the letter is not delivered.

Baseball great Roy Campanella comes to coach the Calverton Boys' League just as Timmy puts in a bid for Lassie to become the team's mascot. But when Timmy overhears two boys bargaining over who will pitch the first game and is threatened that Lassie will not get the mascot position if he tells, he's thrown in a quandary.