Dr. Sarah Parker shares a little transmitter with her daughter Zoe to keep an eye on the recovered bird Zuli, who was saved by Lassie.

Zoe and Lassie are roaming at the Grand Mountain National Park with Ranger Graham Parker. Parker finds out that there were poachers at the park and they failed in capturing a baby bear.

Zoe, Lassie and Harvey finds out suspicious men at the national park who are polluting the river and disturbing the ecosystem. Will Zoe and Harvey be able to rescue the national park gold from them?

Zoe, Lassie and Harvey are excited to meet Kim across the mountains. Kim is in big trouble. Will Zoe and her friends be able to rescue her?

Zoe, Lassie and Harvey finds a secret map of the treasure hidden by the Dan Montaigne. Zoe and friends follow the clues to find the treasure.

Zoe, Lassie and Harvey ride towards the green valley forests to watch deers and deer babies. The forest trees catches fire and Zoe tries to stop the fire.

Zoe, Lassie and Harvey are playing with Graham in a nearby town. Sarah calls them immediately as Mrs. Lee has been bitten by a poisonous spider.

Zoe, Lassie and Harvey finally spend their day at the round up of horses with Graham at the national park. One of the horses in the park is missing. Will Zoe be able to find her?

A localite angrily report that their cows are being killed by a deadly wolf. Sarah decides to figure out what's really going on along with Zoe, Harvey and lassie.

Zoe, Lassie and Harvey meet a nasty teenager named Drew while skiing at a resort. Over confident Drew influences these kids to try a run that Graham has recently closed because of the danger of avalanches. Will the kids escape this danger circumstance on their own?

Lassie and the Parker family's have never actually have their picnic because of their work emergencies. Thereafter, they do realize they're happiest when they are saving the day!

Zoe and Harvey must help out the tornado chasers who survive outside during the dangerous weather conditions. Fortunately, with Lassie to help them they can save the day.

Strolling at the forest, Zoe stays behind to talk with her friends and Lassie heads for home on her own. When Zoe reaches home, she is shocked to know that Lassie didn't came back home and is missing.

Zoe and Harvey make a bet on who can reach home first by taking different paths. Zoe decides to follow her own trail but will she get herself lost without Lassie?

Sarah has to investigate an illness that is affecting the park's deer,. Zoe is left in charge of a baby deer who is resistant to the disease. Later, baby deer is missing and Zoe sets out to find him, taking Lassie with her.

Lassie and the kids look for the home and garden of an aging hermnamed Frances to find a special flower. The old woman is rude and inaccessible which lead the kids in trouble later on.

Robert Humphrey started steam-train tours in Grand Mountain . Lassie and Zoe noticed that they are scaring the park's small herd of buffalo. Graham tells Humphrey to change the train route.

Lassie and the kids found a family of Black-Footed Ferrets, an endangered species at the park. Robert Humphrey has come up with a plan to attract tourists to the park which gets the endangered species in trouble.

Humphrey's niece, Samantha along with her friends come at national park for her birthday. She and Zoe don't get along. Samantha and her group are in danger at skating ponds. Will Zoe be able to save them?

Zoe, Lassie and Harvey head towards the high country with Graham and finds out that the waters of Diamond Lake begin to mysteriously receding, threatening the animals ecosystem. Graham fears that some obstruction may have blocked the flow of waters and investigates further with his rangers.

When Sarah airlifts a wolf and her pups to another park for their own safety, Zoe finds out that one pup has been left behind. Promising the tiny wolf that she will return it to its mother, Zoe and friends begin their journey back to another park.

Lassie spots a condor that's been hurt in the wing. Zoe and Harvey must transport the endangered bird to Sarah's clinic. Later, Lassie realises that there was a chick in the nest of this endangered species too. Lassie and kids rush to save the little one.

Harvey's father was a famous rock climber who had died when Harvey was just a baby. At an event, Harvey feeling sad sneaks out from the Valley to make the dangerous climb to a remote lake. Zoe, Lassie and Harvey's mother, Beth knowing Harvey's feelings, try to catch him before he gets into real danger.

Zoe's father Graham grew up in the Valley. While Zoe knows a lot about her family, one secret was hidden from her, that there is a tiny valley where her father used to go that he never talks about.

The Grand Mountain Adventure Challenge is an annual contest for kids and this year it has a 10,000 dollar prize. Lassie is abducted by unethical coach in hopes of taking Zoe and Harvey out of the race, but he gets shouted back by kids' friendship with the other competitors, who join in the search for Lassie.