Halloween steht vor der Tür. Josh und Yoko kommen auf die Idee, ein Shuttle zu kapern und eine intergalaktische Halloween-Tour zu machen. Brett ist davon nicht begeistert. Unterwegs bekommen sie einen Flyer in die Hände, auf dem eine Halloween-Party auf dem Planeten Treat angekündigt wird. Die drei fliegen hin. Gastgeber Mishbob und seine Leute entpuppen sich aber bald als extrem unsympathische Gastgeber. Sie behüten ein furchterregendes, unter der Erde lebendes Insekt, das einmal im Jahr zu Halloween an die Oberfläche kommt …
It’s Halloween time at Galaxy High and Josh, Yoko, Brett and Fluffy decide to head to nearby planet Treat to do their intergalactic trick-or-treating! When they arrive and begin their door-to-door treat gathering, however, they are sorely disappointed. Instead of yummy cosmic candies and delightful space sweets, their bags are filled with an assortment of bizarre alien oddities! Declaring Halloween officially a bust, they decide to head back to school. But just as they’re about to take off, they see a flier on their ship’s windshield. Upon closer inspection, they realize it’s an invitation to a space-tastic Halloween party! Though Brett’s tired and wants to head back to GH, Josh and Yoko want to put their partying slippers on. And with Fluffy casting the deciding vote, they excitedly head out. Though Brett is disappointed at first, his attitude quickly changes when he arrives at the totally fun gathering. From the alien apple-bobbing to the cosmic pumpkin-carving, the space marshals are having the time of their lives! That is until, one by one, they, along with the other party guests, get abducted by the party throwers (who they come to realize aren’t wearing costumes, but are actually scary-looking galactic ghouls)! What the gang eventually uncovers is that the aliens of planet Treat are collecting them to use as an offering to the giant alien who will be visiting their planet (and who visits their planet every Halloween) at midnight! In the end, the gang has to free themselves (and the other abductees) and stop the mega-alien! In a b-story, the GH gang searches for a little Halloween excitement… and finds it.
