While on the road, Lightning and Mater argue, come across a camp, and get captured by cars with spikes attached. The two are forced to compete in the Thundercone, a deadly battle royal where one has to successfully kill the other, while avoiding traps set around the upside-down cone arena that competitors fight on. The competition, however, is interrupted by the arrival of cars with electricity and solar power. One of the cars, Jeremy, explains that both sides used to be one camping group before conflicts emerged and factions were built. Lightning and Mater attempt to dissolve the fight by giving a speech, but it fails and the two flee, with Jeremy following. At a rest stop, they later see that both groups of cars have made peace. (thetvdb.com)