Timmy befriends José, a new Spanish boy in school (the other boys keep calling him "Josie"), but doesn't know what to do when José's pet coyote Taquita is accused of killing Mr. Ransom's chickens.

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.

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 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.

Ruth is on volunteer tower duty during a dry spell and must take action when a forest fire starts due to a careless smoker. Meanwhile Lassie helps Ranger Wade start a backfire after he's injured in the path of the fire in a fall from his horse.

Timmy and Lassie make the acquaintance of Captain Gene Holter, a man who makes his living racing his two ostriches Romeo and Juliet against horses at county fairs. But when Ruth finds out Juliet, defending a egg she just laid, chased Timmy, she forbids the boy to return to the fairgrounds.

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.

Lassie and Caesar, an Army homing pigeon that Timmy nurses back to health, get so attached to each other that when he is returned to the Army, she refuses to eat, and Caesar frees himself to return to his collie friend. So Timmy decides to see if the Army will let him buy the bird.

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.

When Ruth thinks their cow is going dry, she makes the difficult decision to sell Bessie to the slaughterhousea and purchase a new cow. What they don't realize is that a neighbor's boy has been stealing some of her milk.

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.

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.

Timmy erroneously believes that his operation of a machine he and his friends have made to contact Martians has caused an army plane to crash but the army believes that Lassie's behavior at the time of crash is a clue to accident.

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 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.

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.

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.

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.

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.

When carnival performer Mr. Conte's trained dog Terry is injured, Lassie substitutes for her--so well that he wants to buy her. When Timmy won't sell, the man steals her.

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.

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 bets Lassie's new jeweled collar that she can beat a friend's new greyhound, Pat, in a race, and is chagrined when the collie loses.

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!

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