With only three weeks until Zac's race with Harris, the crew works overtime to finish the UNB10 car. Zac's confidence grows with Ray's guidance. Caitlyn and Curtis discover a possible clue to Christian Maddox's whereabouts. Logan discovers who Zac's been training with. Harris faces a new challenge on his mom's birthday memorial. Curtis takes Brooke for a ride on his bike.

Cast: Ryan Phillippe, Nathalie Kelley, Michael Cimino, Melissa Collazo, Uriah Shelton, Drake Rodger, Nicolas Cantu, Johnna Dias-Watson, Mia Healey, Josh MacQueen, Matt Lanter