An earthquake causes a herd of Macks to stampede through a village. Wilhelmina intends to exterminate them which Jack points out will disrupt the ecological life cycle. Jack is promoted to take care of the threat. Jack plans to rally the Macks away with three Cadillacs and aid from Hermes. Jack manages to herd the Macks and thwart Hammer's ambush attempt. The Mack leader destroys Mustapha's Cadillac. Wilhelmina makes a deal with Hammer to ruin Jack and kill all the Macks. Hammer detonates dynamite and smoke bombs in a nearby pass, but Jack counters him and drives his men away. The Macks make it to their new home.