Jerry, the lame boy who adopted Lassie's son Blacktail, and his dog visit the farm, when the Martins find out Jerry can walk without his brace, but is afraid to try.

Something's raided the family strawberry patch, but the large mysterious tracks puzzle everyone until Timmy catches a glimpse of the animal, describing it as a ""giant rabbit."" In reality it's a wallaby named Pancho--who poses a danger to Lassie!

Cully tells Timmy no animal is all bad, so Timmy befriends a skunk, but no one, not even Lassie, will come near his new friend.

Timmy is trapped on a ledge while chasing a strayed ewe that has just given birth and Ruth desperately tries to get the attention of a nearby helicopter pilot reseeding the hills.

Ruth agrees to babysit Betty Wilder's infant twins, but the young mother arrives early and reluctantly leaves Timmy and Lassie to care for the babies until Ruth returns from an errand. Timmy thinks it will be a cinch--until a marauding hawk chases a frightened pigeon into the bedroom where the babies are sleeping.

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.

Timmy finds out that Bob Alder's dog Butch is going blind from cataracts and that Bob's father wants to have him put to sleep, so Ruth hires Bob to help with gathering corn to help pay for Butch's surgery. But Butch wanders away from the field where they are working.

A blind dog is trapped in a skip-loader and in danger of being buried alive. Lassie risks her life to save the handicapped pup and Timmy helps the dog's owner find work to pay for a sight-restoring operation for his pet.

Timmy and Ruth try to prove that a little chapel should not be sleighted for demolition because a flock of swallows return there every year on the same day, but they may not arrive after a hawk attacks the scout swallow.

Mistaking a fin print on the beach left by a diver for the tracks of a sea monster, Timmy and Culley Wilson let their imaginations get the better of them. They launch an attack on the would-be sea creature endangering the life of the diver.

Timmy cares for a young colt during a neighbor's vacation, and doesn't realize until Lassie has twice saved the horse's life that he has neglected his oldest and best friend.

Movie star Mimi Marlowe has car trouble near the Martin farm and is forced to leave her baby, a pet poodle, in Timmy and Lassie's care. Excitement ensues, as Lassie must save the poodle, which in turn rescues Timmy from a precarious situation.

Timmy is punished for neglecting his farm chores when he joins Willie Brewster to build a vehicle for a go-cart race.

Timmy and Bob build their own bows and arrows to go ""hunting"" like the two bow hunters they met, but when Bob uses one of the hunter's arrows, he hits an unexpected target.

The Martin's new neighbors turn out to be living in an abandoned shack with little food. Efforts to help are rebuffed by the father, but when the sheriff becomes involved, Timmy and Lassie find the father a job and the family enjoys a happy Christmas.

A neighbor's prize bull strays onto the Martin farm and tries to attack Timmy. When the bull is later poisoned, the neighbor accuses Paul of the deed. Detectives Timmy and Lassie launch an investigation to find the real culprit.

When Timmy and Lassie bring home a litter of starving orphaned puppies, rescued from a maurading bobcat, the family tries to save them although one has already died of starvation. Inadvertantly, the pups teach Timmy, who's been relying on Paul to help him with arithmetic homework, about self-sufficiency.

Timmy observes what he believes is a wild horse which becomes a menace to the local farms but persuades Paul to convince the local farmers to spare the life of the horse which is later learned to be an escaped thoroughbred.

While Paul is away, Ruth and Timmy care for a stray dog that Timmy names Duke. But after being involved in a fight, Duke suddenly shows all the signs of rabies.

When the Martins travel by train to Chicago for an agricultural exhibition, as well as to visit Ruth's mother and family, Lassie is taken along, but her crate falls off the baggage car enroute and Tom and Jess, two friendly truckers, try to help her get back where she belongs.

Cully plays host to his old regiment's Army mule, but he and Timmy must save the animal from being destroyed when it suddenly goes mad and begins rampaging all over the countryside.

After finding out the local Army base needs dogs to guard their missiles, Timmy adopts Homer, a German Shepherd from the dog pound to give to the Army, but the dog has become so cowed from abuse that the family wonders if he can ever be trained.

Timmy and Lassie watch in horror as a man raids a golden eagle's nest and destroys her only egg, so Timmy gives the bereaved bird a goose egg to raise.

Enroute to the city to relocate after a drought, a backwoods family stops at the Martins after Timmy plays a trick on them. But when their son Billy Joe finds out his parents plan to give away his beloved dog Mitchell, he swears Timmy to secrecy after returning to the Martins', then he and the dog head for the woods--where deer season has just begun.

When Paul offers to farm the land Cully has allowed to lie fallow, the old man thinks Paul means he should retire. But after Timmy gives him a pep talk, Cully decides to fight back by hitching horse to plow and farming his land again.