Diesel Nation visits garages and takes on challenges with big-time stars.

Special guests join the Diesel Brothers to relive embarrassing moments.

The Diesel Brothers are back with with a 2020 Kodiak and a desert race.

Diesel Dave continues work on the Kodiak while Sam releases "the Kraken."

Mad Scientist Sam's Kraken creation comes to life.

Heavy D surprises the mechanics with his latest build -- a tank.

The guys continue work on the tank and have an Eagle vs. Brat build-off.

The Diesel Brothers work on their rival builds for an off-road race.

Chris Jacobs and the Diesel Brothers host as drivers attempt world records.

Dredgers brave the frigid Alaskan waters hoping to strike gold.

A rainy day leads to trouble when Shawn gets hurt in a bar fight.

Sunny weather brings all dredges out to sea, but conflicts quickly arise.

Adrenaline-seeking repo men chase planes for big dollars across America.

Kevin finds himself at the mercy of a vengeful mechanic and a windy night.

The repo men face menacing mechanics, dangerous swamps and armed cops.

The Kilchers finish Atz Sr.'s legacy rebuild and Eivin suffers a loss.