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.
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.
Roddy Mcdowall reprises his role as renowned author, A. W. Leeds, who is asked to judge student's essays in a televised contest. However, Megan soon learns that her brother's essay was taken from her diary.
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.
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.