We're Going on a Road Trip!

Characters

 * Ben Tennyson
 * Gwen Tennyson
 * Kevin Levin
 * Rook Blonko

Villains

 * Sixsix
 * Sevenseven
 * Eighteight
 * Twotwo

Aliens

 * Diamondhead (first reappearance;X2)
 * Bloxx (first reappearance)
 * Upgrade (first reappearance)
 * Snakepit (first appearance)