Billy shows Kimberly a new machine he made that is supposed to transport people from one spot to another. Curious to see how well it works, they both get inside and end up switching bodies instead! Bulk and Skull show up and get inside later that day, unbeknown st to Billy or Kimberly and they switch bodies too and accidentally break the machine! Now Billy(in Kimberly's body) must fix the machine so that they can be restored.