The Martins replace their icebox with a brand new second hand electrically operated refrigerator which is a change to which Lassie has trouble adjusting.
When Willie tells Timmy about contest for circuit tickets for letters about best pet, Timmy writes a letter on the last day and gives it to Lassie to post but it is made undeliverable when Lassie has to help Willie, Mr. Burke and Mr. Huff.
Roy Campanella arrives in town to instruct the Calverton boys' baseball team during which one of the boys uses threats and bribery to be pitcher and leaves Timmy in a conundrum as to what his action should be in the situation.
The Martins house a man and his horses, one fast and the other lazy, prior to a sulky race at the county fair and when the fast one becomes lame, the man must use the lazy one but Lassie has trained the lazy one to run.
When Timmy gains respect for his courage by keeping pace with a much larger peer in a fight and is asked by the boys to play football, Ruth has difficulty accepting this as part of the growing process.
A foreign exchange student's confession of stealing from Timmy's classmates because of her family's hunger inspires the class to help Ruth in her task as a coordinator for UNICEF.
When the Martin farm runs short of water, Paul hires a geologist to help after refusing Cully Wilson's help with a divining rod which he gives to Timmy who finds a spot that a driller chooses after the first drilling fails.
Timmy has developed the habit of telling tall tales which leads him to befriend a senior woman he has identified as a witch but his habit causes his displeased parents not to believe him when the woman needs help.
Timmy believes he has seen a space alien and food is frequently disappearing from Ruth's kitchen but the culprit is a chimpanzee loose from college experiments.
When Paul is unable to get a neighbor to hospital in time, the Martins realize the need for a closer emergency hospital for which banker/farmer Blalock's land is perfect but Blalock is stubbornly resistant to the idea.
Timmy is locked in a woodshed while selling newspaper subscriptions he discovers that new neighbor Vance is being threatened by a prison mate with exposure of his record as and force to rob the safe at the dairy coop.
When Rudy makes Timmy and Sam Kuramato believe they have killed Flip with a rock that Rudy actually threw, Timmy and Sam run away thinking that they are murderers.
The stock yard owner refuses Paul's lambs because the new foremen has his own suppliers but the foreman and his accomplice have an unusual source for the lambs using a goat which Lassie and Timmy uncover using a silent whistle.
Fearing army reprisal, Timmy and Don use Timmy's pet guinea pig as a replacement for one they let escape from an experimental space craft and in so doing expose themselves to possible radiation.
When a stray dog disturbs area farms, a conflict ensues between the farmers who wan to shoot the pest and the more humane approach of Warden Smith with whom the Martins side. The dispute is complicated when the dog is trapped in a ravine.
Although not taken seriously at the grange meeting about a possible grasshopper plague, Timmy makes the Martins buy supplies to fight a grasshopper invasion and so the Martins are ready when an infestation is announced on the radio.
Timmy trades for a homing pigeon which he takes on Paul's business trip to test her ability to fly home. On the flight back it is attacked and injured but rescued by Lassie with the help of a pigeon suitor.
After an Explorer lectures Timmy's Cub Scout den, the inspired den goes on a hike and wonder into the Badlands where they become stranded on a rock ledge.
Because hoof and mouth disease has been detected in the area so that the authorities want to destroy the Martin livestock, Timmy hides a cow that Paul has bought at a high price because the cow is about to calve.
Jed Ransom wants to shoot Doug Walker's minks blamed for killing area chickens until Walker shows Paul the footprint of a related but much more dangerous animal.
A developer's plans to flood Paul's alfalfa fields which Paul has rented for three years from a bank which gave Paul no notice of the title transfer result in unusual legal events as Timmy befriends the developer's daughter.
Timmy and his classmates buy a baby elephant to donate to the local zoo without acquiring the proper city authorizations so the Martin farm must house the animal for an unknown duration.
Timmy finds a badly hurt rooster that is actually a fighting cock which Ruth nurses back to health but one of the farmers who Paul supplies is an illegal cock fight promoter that steals it for a fight.
When Timmy joins a children's farm club pig raising competition, Timmy's piglet's growth lags while the piglet's continual escape from enclosure puts itself and Timmy in danger.
Chatty Mrs. Harper's belief that Timmy is frivolous with phone use causes her to leave her phone off the hook which makes it difficult to get help for Paul when a power line falls on his pickup during a storm.
To embarrass two hunters from the city for breaking farm fences Timmy and Cully create a false game trail but the trick goes awry when the terrain causes a shooting accident between the hunters.
A Martin lamb is attacked so Paul, Sam Burke and Sam's newly acquired German Sheppard which Lassie dislikes track a bobcat thought to be to blame and the Sheppard kills the bobcat with such ferocity that it looks like a trained killer.
The county is to build a new road taking six feet of farm land so Paul and Enders look for old stone monuments not moved during an original county survey to prove ownership while Timmy moves opossums to a fence to delay the county job.
An alligator escapes from a water circus and heads for a lake near the Martin farm where Flip and Timmy are put in danger time and again being unable to interpret Lassie's warnings and behavior.
Timmy's Mothers Day gift is switched with Willie's gift which is much more expensive but Ruth likes the gift so much Timmy is afraid to tell her and puts himself in danger to make good on a deal with Willie to pay her the difference.
Area folk dislike a hermit befriended by Timmy who is believed by Mr. Watson to have harmed Arnie but Arnie has slipped on to a cliff ledge and the hermit, a former climber, must rescue Arnie.
