OCC continues on their latest double build — custom bikes for Craftsman Tools and DieHard Batteries. After a jam session with rock ‘n’ roll legend Chubby Checker gets OCC doing the twist, both teams race into assembly and the Sr.-Jr. rivalry heats up. But as Team Craftsman is delayed, Team DieHard pulls ahead and Mikey moves forward with his latest project, recruiting Sr. to lend a hand. Once Mikey’s unusual creation passes its test, Sr. and his team must rally to get their Craftsman project done.