Project vehicles: Scion XB (red), Scion XA (blue).

In this season finale, two teams turn cars into Rock 'Em Sock 'Em robots. The winning team will receive Jesse James custom Mac Tools toolbox worth $6000. In this episode, build days 1 to 4 are shown.

Red Rocker designers: Mike Desmond, Eric Tscherne (Hot Wheels designer), Wink Eller.

Blue Bomber designers: Jonathan Bedford (Mattel designer), The Pizz (lowbrow artist), Eric Scarlett.

Red Rocker builders - previous work John Babek (as Jon Babek) - NASCAR street sweeper Lisa Legohn - Fire fighting limousine Mike Stapleton - Mazda RX-7 sandrail Cindy Regimbald - 'Black Widow' demolition derby car Dwaine Jungen - Toyota Tundrinator Wink Eller (Captain) - Fire fighting limousine

Blue Bomber builders - previous work Eric Scarlett (Captain) - Porsche Golf ball collector Steve ""Tombstone"" Sterle (as Tombstone) - Cadillac Hearse Grim Ripper, Cadillac Hearse Grave Digger Jason Jessee (as Jason Jesse) - Mobile Half pipe ska