Robert Humphrey begins running steam-train tours in Grand Mountain which Lassie and Zoe see are scaring the park's small herd of buffalo. Graham tells Humphrey he must change the train's route. Humphrey ignores the warnings and sends the train down an old and damaged track. Now, not only are the buffalo in real danger, but every passenger on the train is at risk... and only Zoe and Lassie can prevent a disaster.
After Lassie spots a condor that's been hurt in the wing, Zoe and Harvey must transport the endangered bird to Sarah's clinic. Lassie realizes the Condor has left a chick in her nest and the kids realize they must save TWO generations of this endangered species. With fewer than 400 of these rare birds left alive, their mission is a vital one.
Zoe's father Graham grew up in the Valley. His grandparents were some of the area's first residents. While Zoe knows a lot about her family, one mystery remains: there is a tiny valley where her father used to go that he never talks about. In fact he's never revealed its location. Harvey figures out where the valley must be and he, Zoe and Lassie hike in to discover the truth about the spot.
The Grand Mountain Adventure Challenge is an annual contest for kids. The Challenge tests kids' abilities in canoeing, hiking, rock climbing and orienteering - and this year it has a 10,000 dollar prize. The unprincipled coach of one team kidnaps Lassie in hopes of taking Zoe and Harvey out of the race, but he has underestimated the kids' friendship with the other competitors, who join in the search for Lassie. And he has also severely underestimated Lassie's own resourcefulness and ability to escape. Zoe, Harvey and Lassie return to the starting line just in time to begin the race.
The Grand Mountain Adventure Challenge begins with Zoe and three other teams competing. From the beginning, things begin to go wrong for each of the teams. One by one, each of the other competitors gets into some kind of trouble and Zoe and Harvey have no choice but to put their own progress on hold while they save their friends. They discover that these mishaps were no accident and come to realize that one team is cheating...
Danny is excited to team up with Vanessa for a school project, but when Vanessa’s mom overhears The Cannon’s expletive-laden rant, she tells her daughter to request a new partner.
Terry tries to help a love-struck Lulu catch the attention of Patrick, the new doctor in town...but it seems he has more in common with tomboy Terry than with girly Lulu.
At Malcolm's funeral Cleaver meets Mal's sister Felicity, a honey blonde with an acid wit; and baulks at being Scarlet's junior in the case of a gambling-addicted client.
Maggie reveals Cohle's activities in 2002, when his relationship with Hart fractured and he quit the force.
Guardianship duties fall upon Lip - who gets some unexpected assistance.
The league suspends the Cannon from the team after video surfaces of him being insensitive towards the kids. Terry has to change her father's old school ways of thinking and try to re-unite him with the team.
Marty and Jeannie come up with different approaches on how to deal with Lukas' attempts to sabotage DollaHyde. Meanwhile, the relationship between Roscoe and Lex becomes a problem for Marty.
Bonny confesses. Rackham makes a life-altering decision. Richard forces Eleanor's hand. A chess match is organized for Flint and the Walrus crew.
An old enemy emerges while Ben and Rook visit Kevin and Gwen at college.
A super moonwalk, a tightrope stunt and a whistling walrus are featured. Also: A monk throws a needle through glass.
The Cutie Mark Crusaders are thrilled when Twilight offers to help them with their studies. Problems arise when the girls realize they can use their relationship with Twilight to increase their popularity.
Eager to start her life anew, Abigail concocts a bold but costly business proposition, while Elizabeth and Jack go to bat for a struggling student.
In 1200 AD at the same time the Vikings were discovering North America along the East Coast, new evidence suggests another group of intrepid voyagers may have been discovering the New World on the opposite end of the globe. When an obsidian spear point of mysterious origins is discovered by a group of hikers on the island of Maui, Scott Wolter is called in to investigate. Delving into it's origins, he discovers the artifact may have come all the way from Mexico--and is just one more clue in a mounting pile of evidence suggesting Polynesian voyagers made it there and back. What Scott wants to know is if they made it to Central and South America, could they have made it all the way to North America?
MythBusters is a science entertainment television program created and produced by Australia's Beyond Television Productions for the Discovery Channel. The show's hosts, special effects experts Adam Savage and Jamie Hyneman, use elements of the scientific method to test the validity of rumors, myths, movie scenes, adages, Internet videos, and news stories.