1 - Welcome to Catalina Island

Host Phil Keoghan welcomes 12 new crew members to Catalina Island, off the coast of Southern California; competitors must build a concrete retaining wall for their first individual competition.

2 - Perfect Symphony

Part two of a special two hour season four premiere.

3 - I Look Like Curious George

Crew members visit a plant nursery where attention to detail is key when building a complex planter box in the individual challenge.

4 - That's a Safety Hazard

Diesel mechanic Quincey Walker guides the crews through a series of challenges that involve servicing automobiles.

5 - Crush It!

Savage Crew and Dirty Hands get tangled up in the team challenge when they must organize and load a 15,000-pound fishing net onto a boat.

6 - Rise and Grind

Crew members compete in pairs to shrink wrap a large container, with the last couple to finish facing the overtime challenge where one person will be eliminated from the individual competition.

7 - Skills to Pay the Bills

Season three competitor and carpenter Lamar Hanger returns to guide the crews through a series of construction challenges.

8 - Pressure Is On

9 - This Is Not a Sprint, It’s a Marathon

10 - Keep Battling ‘til the End