Uncle Steve is shot by an over-eager hunter and Lassie is impounded for attacking the hunter. Now Will must rescue his canine friend and Lassie must get help for the unconscious Steve.
After accidentally getting locked in the back of a truck, Lassie finds herself lost in the city and must find her way home, befriending a runaway along the way.
Megan and her friend mysteriously become sick after skinny-dipping in a stream. Chris, Will and Lassie do some investigating and learn that the cause may be linked to illegal chemical dumping.
Chris and Dee McCullogh are upset the police officer is handing out fliers stating Halloween is dangerous and that children should remain at home, so they decide to conduct an old fashioned Halloween with all the block parents supervising.
A miniature horse that Will is temporarily taking care of becomes the source of contention between the McCulloughs and a neighbor who's a local politician.
Will and his friends are trying to qualify for the finals in a bike-racing competition, and Lassie is having her puppies. Will selflessly gifted his prized bicycle to Kyle and encourages him to finish the last lap. Everyone is rewarded.
Megan feels she is outgrowing her childhood. A mysterious Mr. Shepard arrives looking for work. Dee and Chris put him to work at the local fundraiser. Mr. Shepard saves Megan from danger, and her childhood feelings are magically restored.
At a party, Will is the intended target of a practical joke, but the joke turns serious when both he and the joker are trapped beneath a crumbling structure.
Chris and Dee are off celebrating an anniversary, Will is at a friend's and Megan and Lassie are home when a boy accidentally crashes his motorcycle into the garage, but no one knows that the accident ruptured a gas pipe.
Uncle Steve returns and takes Megan and Will hang-gliding, but when the glider crashes with Steve and Will aboard, Lassie and Megan must find a way to save them.
Ancient Indian relics originally uncovered by the McCulloughs are in danger of being stolen from the site, and Dee's archaeologist friend may be involved.
Chris' new job is located on a former military shelling site that's supposed to have been cleared, but when Will, Megan and Lassie wander onto it they find themselves surrounded by still-live shells.
Laid up at home alone with an injured leg is not the safest place for Will to be when the McCullough house is targeted by a pair of neighborhood burglars.
On a dare from a friend, Will agrees to spend a night in an abandoned house. However, an unidentified man sets the house on fire and attacks Lassie. At the court hearing Will and Lassie both give their testimony.
