Experimenting with alternate dimensions, Dib gets stuck in a spooky world created by his own imagination. The monsters inhabiting this alternate reality want to leave but the only way to do so is to go through Dib's head. Dib recruits ZIM to find a way back to reality.

Carl and Sheen are looking for the ultimate scary costume for Halloween, and Jimmy is just the kid who can help. With his latest invention, The Neutronic Monster Maker, Jimmy transforms his friends' physical appearances into those of a Vampire and Werewolf. But the effects of the transformation don't stop at crazy body hair and pointy teeth; Carl and Sheen quickly mutate into real monsters. Jimmy must reverse the effects before Carl and Sheen wreak havoc in Retroville.

Cat chides Dog for being afraid of a horror film, but begins to get scared himself when he sees signs of the movie monster -- Toothpickhead -- around the house. Toothpickhead appears and chases CatDog all over the house. Cat thwarts the monster by shoving him inside a toaster. They unmask the monster and find out it's Winslow! CatDog and Winslow have a good laugh -- until the real Toothpickhead shows up to chase them all away. Tired of not getting his way, Cat hires a Pig to join CatDog in an attempt to out-vote Dog.  With a leather harness, the Pig is strapped on to CatDog's body to form CatDogPig. However, the Pig has more in common with Dog and Cat becomes the minority.

The Puppetmaster: Special Halloween episode. The kids investigate mysterious disappearances in a spooky town. Katara makes a special connection.

Arnold's best laid plans for the "Ultimate Saturday" go up in smoke when he tries to complete all of his favorite things to do in one afternoon. All the while, Grandma and a team of wacky movers try desperately to move a piano into the building. On a boring summer night Grandpa tries to liven things up by telling a story about haunted Train Number 25 which comes back to earth on the anniversary of its last ride -- the mad engineer wants to take unsuspecting passengers away to the spirit world!

Discovering a vampire hiding in the freezer, Josh and Parker think that becoming undead is the perfect plan to get away from all the boring rules they endure every day working for Mr. Meaty. But they quickly discover that being a vampire bites! / When Lizzy, a new girl employee, arrives at Mr. Meaty, Parker quickly falls for her - she's a messy eater, she likes Star Raiders, and her burps smell like his favorite burger combo! Only problem is, Josh thinks she's pretty hot too! The two boys get into a game of one-upmanship, trying to impress Lizzy.