A trooper clashes with an intoxicated gold miner in the Season 4 opener. Also: a search-and-rescue mission for missing snow-machine riders.

Source: National Geographic Channel

Included: a search for a potential survivor of a snow-machine accident; a manhunt for a stabbing suspect; a chase involving a speeding vehicle.

Source: National Geographic Channel

A trooper must trek through heavy snow to respond to a domestic-violence situation. Also: an armed man in a cabin; an attack on a public-safety officer.

Source: National Geographic Channel

The troopers respond to reports of a gunman in Fairbanks and attempt to control some potentially unstable fishermen in western Alaska. Also: a high-speed motorcycle chase.

Source: National Geographic Channel

A new trooper deals with illegal alcohol manufacturing in a remote village. Also: A thief is hunted; a trooper making a traffic stop learns that the driver is a notorious meth cook.

Source: National Geographic Channel

Two troopers hunt down a man involved in a machete attack.

Source: National Geographic Channel

The State Troopers investigate human-like remains found by campers and patrol the wild Arctic Man festival.

Source: National Geographic Channel

A trooper deals with armed and hostile residents; suspects who were caught speeding abandon their car and flee into the woods on foot; a trooper gains an unusual ally when he sees a suspicious man carrying a gun.

Source: National Geographic Channel

A man threatens his pregnant girlfriend with a gun. Also: a search-and-rescue mission; a potentially deadly case of road rage.

Source: National Geographic Channel

Troopers confront a man who is living illegally on public land; a toddler vanishes in the woods; and a man with a warrant hides in a remote village on the Yukon River.

Source: National Geographic Channel

A trooper tracks a notorious drug dealer in the Matanuska-Susitna Valley.

Source: National Geographic Channel

A trooper tries to rescue an injured woman from a car wreck on the Kenai Peninsula.

Source: National Geographic Channel

The troopers respond to flooding that resulted from a storm surge.

Source: National Geographic Channel

A trooper rushes to save a disabled man from a fire.

Source: National Geographic Channel

The troopers embark on a sting operation at the home of an infamous criminal who may be harboring stolen weapons.

Source: National Geographic Channel

A trooper investigates a deadly fire in Alakanuk.

A trooper must confront an erratic and hostile driver.

A trooper breaks up a violent family feud involving two intoxicated brothers.

Source: National Geographic Channel

A trooper rushes to rescue children who are trapped in their house with a burglar; another trooper protects fishermen from a bear.

Source: National Geographic Channel

A trooper tries to save the life of an illegally shot calf while simultaneously pursuing the hunter.

Source: National Geographic Channel

Two troopers brave freezing temperatures to rescue a missing pilot; a Fairbanks trooper hunts for a snow-machine thief; and a violent burglary is stopped.

Source: National Geographic Channel