Hiking in the forest, Zoe stays behind to hang out with some older girls she admires and Lassie heads for home on her own. When Zoe arrives home later, she's concerned to discover that Lassie never came home. Now while the whole community searches for her, only Zoe knows the dog well enough to find her.
With the first snows of winter on the way, Zoe, Lassie and Harvey ignore Graham's warnings and track a tagged bird they have released into the wild. The three rescue the bird, too weak to migrate south, but not until they've exposed themselves to a dangerous blizzard.
Zoe, Lassie and Harvey head into the high country with Graham when the waters of Diamond Lake begin to mysteriously recede, threatening the animals who drink from the lake. Graham fears that some obstruction may have blocked the flow of water. When the rangers discover a logjam that has dammed the creek that feeds the lake, they set to work busting it up... never knowing that Graham has become trapped in an underground channel that will flood the moment the logjam is broken.
Lassie and the kids have found a family of Black-Footed Ferrets living in the park! These rare animals are endangered and the kids are excited to see their den protected. At the same time, Robert Humphrey has come up with a plan to attract tourists to the park by paying Nick Connelly to impersonate a legendary "Loch Ness" style monster. When Humphrey's plan is more successful than he expects he sets off a stampede of curious tourists that threaten the endangered animals.
Humphrey's niece, Samantha, brings a group of girls up from the city for her birthday party, she and Zoe don't get along. When Samantha's choice of skating ponds puts her whole group in danger, Zoe intercedes, saving Samantha and finding a true ally - which is a good thing, because it's going to take both of them together with Lassie to save Harvey's life.
Harvey's father was a famous rock climber who died when Harvey was just a baby. When a Park event leaves Harvey feeling the loss of his father very strongly, he sneaks away from the Valley to make the dangerous climb to a remote lake that was his father's favorite spot in the world. Guessing where he's gone, Zoe, Lassie and Harvey's mother, Beth, hike after Harvey, hoping to catch him before he gets into real danger. In the end, Harvey's own gifts and Lassie help the boy reach the remote lake and share a moment with his father.
It's a Brown family first when the wives take a road trip to San Francisco without Kody! The wives decide to work on their relationships by going dress shopping for their commitment celebration. And with the women gone, Kody is home alone with 17 kids.
Cold Open: Piers Morgan Tonight Sketches: Mazel Tov Aubrey, Hip Hop Classics: Before They Were Stars, Nancy Grace, New Years Resoultuion, Pajama Party, Indiana Jones Spectacular, Detention, Morning' Miami, I Know
Model Coco Austin returns to her former New Mexico home where she was tormented by a dark entity.
A fleeing vehicle goes for a spin when officers execute a perfect PIT maneuver. Cops try to flush out a suspect who barricades himself inside a donut shop. Officers hit the meth mother lode when they stop a truck in a downpour.
After Dr. C tampers with Sqweep's project, the alien receives a bad grade.
Golan believes the tooth fairy is real, and he informs everyone they’re in a relationship.
Jonathan Ross welcomes more big names to his star-studded chat show. Guests tonight include film star and comedian Russell Brand, Birds of a Feather actress Linda Robson, X Factor and National Television Awards host Dermot O'Leary and popular musician James Blunt, who also performs live.
Clay makes it clear to Elena that he's still very much interested in her, but she keeps her distance, focusing her attention on tracking the killer "mutt" and getting back to her human life in Toronto. However, the discovery of a second body on Stonehaven property keeps the prodigal werewolf in Upstate New York indefinitely.
It's wall-to-wall automotive mayhem, as the MythBusters drive through glass, plow through traffic, and fire an RPG at an SUV to take aim at classic Hollywood crash cliches.
Emma Willis and Marvin Humes present the second round of blind auditions.