

Now that Zoe and Harvey are old enough to take part in the Grand Mountain treasure hunt to celebrate the founding of the park, they are determined to win the race with Lassie's help. While Zoe shows her headstrong nature by turning down her mother's help, doubt soon sets in when her big rival, Samantha, somehow manages to stay one step ahead of our heroes on each challenge.
It’s "Adopt-a-Puppy" day and Zoe and Harvey host Olive and her father who have come in search of a new family friend. But the puppy Olive falls for does not turn out to be as courageous and Lassie-like as her father would have liked. Zoe relives the first time she met her beloved dog, at the same time as her best friend Harvey, who had just arrived in the valley!
Olive and her father listen as Zoe relates how she and Lassie were trapped by a forest fire after Harvey had left them to seek help. While young Lassie demonstrated her extraordinary devotion to help the young Zoe from her predicament, our heroine once more demonstrates her mettle when Olive's puppy gets lost in the park and Zoe is called upon to find it.