The Discovery Channel HD (Pacific)

Fighting for their countries and a $200,000 prize, competitors from Australia, Brazil, Mexico and the USA must take on a 24-hour insertion challenge; surrounded by Africa's apex predators, each team is immediately tasked with making primitive fire.

Near Gary, S.D., expert chasers and certified weather spotters self-shoot an encounter with a long-track, shape-shifting tornado; when the twister takes a turn towards an occupied farmhouse, chasers are thrust into the role of first responders.

Hurricane Helene barrels north into Appalachia, dumping 30 inches of rain; as hundreds of cameras capture flooding and mudslides, one woman gets swept away by the deluge, until a man attending a wedding rehearsal jumps into the water to save her.

Deep in the Northern California wilderness, Russell stops at nothing to reach a nesting site; Mireya and Bryce uncover evidence that a family of Bigfoot is nearby; Ben speaks with a witness who had a chilling encounter with Bigfoot.

While searching for better ground on Lightning Creek, Rick is rocked by surprising news; Parker gets greedy and expands his Sulphur claim; Mike pivots on Paradise Hill to impress Tony.

A tense confrontation ensues when Wardens Scott and Gould respond to a call about an illegal deer hunting case; two raccoons find their way to a gas station and must be trapped; Warden Boone handles a disgruntled hunter at a deer hunting club.

In Texas, a woman is found in distress on the side of the highway; Warden Hensz handles an aggressive family of owls; Warden Bailey responds to a call about underage drinkers holding a fishing tournament.

Warden Price is on a mission to arrest out-of-state hunters with warrants for trespassing and hunting on private property; a young angler is haunted by his past and is taken to county jail; Warden Richards questions a pair of dishonest fishermen.

A check for a fishing license takes an unlikely turn; an abandoned car is found on private property; Wardens Sellers and Roraback are in pursuit of illicit hunters; zebra mussels are suspected of being illegally transported in Llano County.

The tow truck drivers hustle on the craziest night of the year in Las Vegas: New Year's Eve; Jeremy tries to break a record; Elmer makes a life-changing decision; Pineapple faces the wrath of his boss.

It's a race for the most tows as thousands of fans descend on Las Vegas for the Formula One Grand Prix; TW subdues a raunchy party while Shawn confronts a racegoer carrying a big wrench; Elmer's frustrations with The Tow Truck Company come to a head.

Tensions run high on the streets of Las Vegas as the year comes to a close; Elmer has a blowout with his boss; Pineapple rips into a new driver over their worst tow ever; Nick deals with a raging customer.

Pineapple argues with a woman who has a hall pass from her husband; Jeremy gets in a fight, and Elmer hunts for a massive haul; TW's easy tow turns into an ordeal, while a crazy customer goes ballistic on Bridgett; Shawn makes a spooky discovery.

A drunk man dressed like a giant baby refuses to let Shawn tow his car; a frightening find spooks Pineapple; during a call at a haunted house, the tow truck driver is terrified.

Two men are caught attempting to smuggle a rooster for cockfighting; officers find millions of dollars of counterfeit goods; a woman flees after dumping drugs on the bridge; an illicit load is found hidden in the axles of a lowboy trailer.

Officers find a man and his family driving a suspiciously modified truck; a young man is caught with narcotics strapped to his body; a crosser is detained for having a record of smuggling an illegal migrant across the border.

Officers find a box of syringes filled with a mysterious black liquid; a computer programmer from South Korea raises suspicions when he says he's coming for business meetings, but it sounds like he's planning to work in the US illegally.

Officers find a fraudulent passport hidden in a video game case, a telltale sign of criminals at work; a traveler who just returns from Paris claims she has nothing to declare, but a search of her bags reveals a suspicious $200,000 diamond watch.

In Atlanta, an officer discovers evidence of a lottery scam - a tactic used by criminals to trick victims into giving up thousands of dollars in exchange for alleged winnings; this find could lead CBP to uncover the network behind this nefarious ploy.

After two unclaimed cargo packages are opened, experts are called in after officers suspect that they may contain stolen ancient artifacts; when a family heading to the Middle East is found carrying more than the allowed $10,000 limit, questions arise.

In Oklahoma, a suspected drug dealer leads police on a perilous pursuit down a busy interstate; in Michigan, an officer comes under fire from a masked gunman; in Missouri, a sting operation goes wrong when the armed suspect takes off on foot.