A man who professes to be protecting the forest tries to sabotage the Forest Service's new balloon logging program. After shooting at Corey's truck, cutting a telephone line, and sabotaging a bulldozer, he's ready to do even more damage.

As they take an elk survey, Scott and Lassie's helicopter ride turns deadly when the vehicle has has mechnical problems and crashes in the snowy wilderness. Bert tries to at least fix the communications system, but that too is beyond hope; they must rely on their survival gear and wait for rescue.

Neeka, spending his vacation with Scott and Bob, is delighted to help the rangers out at the Roaring Camp spur line, a railroad that will run directly through the majestic redwood forest. There they befriend a persistent little bantam chick (Neeka names him Fairbanks) who is constantly wandering into trouble.

While Bob and Dan are scouting out the rapids for a ""whitewater trail"" for tourists, Lassie finds a baby raccoon that has been poisoned by ""pink snow""--the same material she has already eaten. The only way to get her help--a trip down the worst of the rapids.

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.

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Garth takes Lassie with him on his visit to Vandenberg Air Force Base, where they meet Jimmy Fredericks, a boy with a weakened leg who has given up believing he will ever walk normally.

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.

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

Mute Kerry continues to help Lassie and her puppies elude his father and the sheriff, who's determined to kill the pups, and by the time the rancher learns Duke was the father of the puppies, it's almost too late.After everything is revealed, Kerry's father let's him adopt one of Lassie's puppies.

Timmy believes one of Uncle Petrie's tall tales and is hurt to discover he has been lied to. A gift of a friendship ring, crafted by Uncle Petrie himself, mends their relationship.

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.

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

In the second of a two-part series, Lassie finds Bruno, a retired war dog that has been spooked by dynamite explosions. Lassie tries to calm the frightened and confused canine, and must intervene to prevent ranchers from shooting the dog before his master arrives.

Lassie befriends a trouble-prone mutt who is mascot of an old railroad spur line.

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Timmy refuses to attend the Grange Square Dance out of fear that he will have to dance with a girl. After Uncle Petrie reassures him this will not happen, he relents. To everyone's surprise, a fire disrupts the children's dance and Lassie must save the day.

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.

Timmy learns a lesson in obedience when he takes a job as water boy at a traveling carnival. He disregards an order, inadvertently allowing a tiger to escape from its cage.

Scott, Lassie and Neeka camp overnight in an old mining town that is haunted, according to legend, by a wolf and a man. Despite Scott's assurances there are no ghosts haunting the town, Neeka and Lassie hear strange sounds and see things that have even Lassie spooked.

A crate holding a penguin enroute to the Capitol City zoo falls off its truck, and Timmy and Scott adopt the creature

While Neeka's father and Scott nurse an eagle that has become sodden from a fall in the lake, Lassie protects the bird's baby from a lynx.

Neeka must take charge when Lassie breaks a leg in a trap on a hike--and a wolf is stalking them.

Lassie's search for her identity takes her to a wax museum and finally down to the waterfront, where she is befriended by a down-on-his-luck young fisherman with a family and a boat loan he can't pay off.