In the opening, Kang hopes to speed up an exceedingly slow and boring baseball game, despite Kodos' protests, but ends up destroying the universe when the baseball players go so fast, they turn into a killer vortex which sucks up the universe, even God. When Kodos berates Kang off-camera for destroying the universe, Kang responds by leaving a post-it note on the white void, revealing the title of the episode.

Bart winds up in a coma after attempting to jump from the roof to the swimming pool at Spinster Arms Apartments. In an effort to cope with the loss of their boy, the family takes in a robotic boy, named David, who quickly proves to be a better son. David can make ice cream with his nose, make plushies with pants and even recalibrate the lights of the town to spell words.

Later, Bart is found to be alive. He escapes from the hospital and seeks to plot revenge on David. However, Bart is dumped on a road by Homer, but Bart finds a group of old robots. He steals their parts and in the end, he cuts both Homer and David in half after becoming a cyborg. Eventually, Homer, who no longer has his legs, now has to be fused with David's legs.

Before the situation can get any crazier, it's revealed that the entire robot scenario is a dream conjured by Homer's demonically possessed mind as he's being exorcised.

In a parody of The Most Dangerous Game, men from Springfield come to Mr. Burns's mansion to go hunting. Unbeknownst to them, they are the prey to be hunted. The hunt appears on TV, and Marge, watching from home, claims she should have known something was up when seeing the new TV Guide, which featured a picture of Burns and Smithers chasing Homer.

Homer manages to survive the night while his friends and the others are killed left and right, but Burns closes in on him in the morning. Just as he is about to be shot, Burns and Smithers are both knocked out with frying pans by Marge, who then hits Homer for being away from home for eighteen hours and not calling, before they end up having make-up sex.

The citizens of Springfield dress in their Halloween costumes for a costume contest. Dr. Hibbert is declared second placed victor. The first place winner is a strange old witch. She is given the award and is asked who she is. She is therefore forced to admit that she is a real witch. The reason why she even went to the contest to compete is unknown. As a result, her reward is rescinded because she is not in actual costume. In anger, she turns everyone into their costumed characters and glides away on her broom.

The only person who can reverse the spell is Maggie, who was costumed as a witch, and now really is one. Half the townspeople want to be turned back into their normal selves (those who were dressed in costumes of horrible monsters, such as Ned Flanders, who was turned into a flower and the Bumblebee Man as a giant bee is obsessed with him, Marge, who became a skeleton), Homer is beheaded but alive and can't drink beer without spilling it. While the other half wants to stay as they are (those whose costumes actually improved their lives, e.g. Bart, who has become a werewolf, Millhouse is bulldozer with his head, Moe, turning into Hugh Hefner which attracts women to Moe, and Sideshow Mel, turning into Spider-Man).

Maggie then turns them all, including Dennis Rodman, into pacifiers with their normal heads for no apparent reason other than her obsession for pacifiers, and flies off on a broom to the theme tune of the television series Bewitched.