Mac (Lucas Till) and his team enter the intensely competitive world of Italian car culture in their pursuit of a deadly crime boss who has gone into hiding in the new episode "Barn Find + Engine Oil + La Punzonatura + Lab Rats + Tachometer." During the mission, Mac is forced to lean on Desi (Levy Tran) after discovering that he seems to be losing the ability to control his hands. Tristin Mays and Meredith Eaton also star.