In the House

Mordecai tries to get away with a Halloween scam involving fake children. After being caught red-handed by one woman, he quickly flees the scene. Rigby, dressed as a robber, then comes out of the bushes trying to trick or treat, but horrifies the woman. The two then approach a very old and creepy house, and Rigby begs to do one more house.

Rigby goes to the house, at knocks at the door when the porch light on the house shuts off. Rigby, enraged, eggs the house against Mordecai's warnings. The house turns out to be owned by a vengeful wizard, who comes out of the house and puts a curse on Rigby. The next day, a fearful Rigby is transformed into a house.

Mordecai goes to send Rigby's apologies to the wizard, but he once again acts like he is not home. At the park, inside Rigby's living room, the phone rings, and the wizard states that the transformation is just the beginning of Rigby's punishment. Benson interrupts him, and the wizard vows that the parks employes will pay just as much as Rigby will. Everyone takes refuge inside house Rigby, and everyone gets a different weapon. Muscleman is on the porch when a black car drives up. The door opens, and no one emerges.

Muscleman is taunted and pulled into the woods by an unseen force. He emerges, but has been skinned alive. The disconnected phone rings, and High-Five Ghost picks it up despited everyone's warnings, and is pulled into the phone and shot out as a liquid. The Wizard, still unable to be seen, knocks Mordecai unconscious, and breaks Skips' crossbow. He then pushes Skips into and up the fireplace and shoots the flame up after him, incinerating him. Benson is found in the bathroom, and drowned when flushed down the toilet. Pops is sitting on the bed in his room, and is pulled into a dresser, which then is disintegrated. Mordecai comes to, and has his head cut off by an invisible force. Rigby, in the form of a house, is the only one left.

The Wizard then teaches Rigby a lesson by egging him, to Rigby's surprise, and finishes him by cracking a giant egg on him, crushing and drowning him. At the end, it turns out it was just a made-up story by Rigby. Muscleman is disappointed, and Rigby responds that it isn't over, and Rigby then turns out to be the wizard in disguise. Everyone screams as a Wizard rushes towards the screen and says "Happy Halloween", leaving everyone's fate unknown.