TV Guide Discovery Channel Friday

Participants attempt to endure a survival challenge on a Nicaraguan island, which is swarming with bull sharks, big cats, and a variety of other predators.

Survivalist Lynsey is at odds with her companion, Darvil, whose lone-wolf tendencies become destructive in the grueling landscape of Lapalala, South Africa.

Amateur drivers challenge one another by presenting hand-made, motor-less vehicles, which are judged for their aesthetics, their speed and their road-holding.

When the Time Bandit loses power with a storm at its tail, Johnathan deploys a camera probe to find what's snarling his propeller; Keith sets a decoy string.

EJ Snyder and Jeff Zausch evade venomous pit vipers, fight a wild boar, and overcome treacherous terrain in the Araucaria forest of South America.

EJ and Jeff find themselves starving, thirsty, vulnerable and surrounded by lions in the hostile terrain of South Africa's Wild Coast.

Two "Naked and Afraid" veterans, EJ Snyder and Jeff Zausch, must figure out together how to survive the scorching-hot savannah of southern Brazil.

Mike teams up with a second-generation pool fixer in West Palm Beach, FL, where he assists in cleaning out 17 years' worth of filth in America's dirtiest pool.

Mike helps the Millennium Seed Bank Project collect and preserve seeds, which is being done in case a catastrophic even destroys all plant life.

Mike gets a surreptitious look at a Mardi Gras "Folly" float while assembling a unique charm that will be used to repel malicious spirits during the parade.

While in Utah, host Mike Rowe travels out to a remote site near the city of Moab in order to learn the particulars and technicalities of paleontology.

As hurricane season hits Newfoundland, a skipper races to salvage his cod season and a crane trainee is put to the test.

When a load of dangerous goods comes in, a rookie operator is tested with the offload, while a family of fishermen hook the ultimate catch.

In the face of harsh weather, an emergency repair threatens vital deliveries and a veteran skipper has one last chance at a big catch.

Rick, Parker and Kevin face off to see who's the best rookie boss.

Parker launches a cutthroat plan for a 10,000-ounce season, and he poaches a rival's crew member; Tony cashes in early with a big score.

Tony battles a big beaver to get at the gold. Parker poaches more crew, doubling gold production. Rick tries to strike a deal for a new claim.

Cameras return to follow the Hoffman crew as they confront new obstacles and challenges during their mission to excavate gold from the northern wilderness.

Only 48 hours remain until the bid deadline, and Jared and his crew race to stack high-dollar cedar before the buzzer rings.

The harbors are bustling and it's all hands-on deck; as countless ships arrive, one fisherman fights to head out before the season closes.

During monsoon season in Arizona, Freddy and Juan try to fix a group of friends' operation and recover enough gold to stop the investor from pulling out.

Cameras return to follow the Hoffman crew as they confront new obstacles and challenges during their mission to excavate gold from the northern wilderness.

Only 48 hours remain until the bid deadline, and Jared and his crew race to stack high-dollar cedar before the buzzer rings.

The harbors are bustling and it's all hands-on deck; as countless ships arrive, one fisherman fights to head out before the season closes.

During monsoon season in Arizona, Freddy and Juan try to fix a group of friends' operation and recover enough gold to stop the investor from pulling out.

A blind man fights for his life after his gift lands him in trouble; an infamous con man finds a shocking way to outsmart casinos and the authorities.

The team sells a commemorative gun collection and enters into a friendly contest with an Omnibot2000; an appraiser tries to uncover the origins of a telegraph.