Sylvester finally eats Tweety on Halloween night after Witch Hazel leaves to get some ingredients for her stew. Feeling sleepy after what he ate, he goes upstairs to sleep in a nearby bed. He then has three terrifying nightmares involving Tweety.
The first one is about getting up after a sudden bout of hiccups. Sylvester looks for antacid, believing what he ate didn't agree with him, only to be shocked by a haunting familiar sound, Tweety zombies, who come towards the house to devour him. Sylvester blocks the doors with wood. After trying very hard to bang the doors and windows to get in, there is silence, and then a doorbell. Sylvester idiotically answers it, only to find nobody outside, but when he closes the door and looks behind him, he sees a wave of Tweety zombies who devour him.
Sylvester is awoken and goes back to sleep. The second nightmare is about Sylvester being awoken by something flapping in the room. He finds Tweety as a vampire who drinks his blood after hypnotizing him.
Sylvester wakes up again and falls asleep for the last time. He wakes in a mummy's tomb where he sees Tweety as a mummy. He then laughs at the size of Tweety and thinks that a mummy that small couldn't harm him and attempts to eat the Tweety mummy, telling him he was "going from that sarcophagus into [his] esophagus." Tweety mummy is stronger than he appears, and wraps Sylvester in bandages and throws him into a sarcophagus.
Sylvester is awoken by Witch Hazel and is given some sort of medicine which transforms him into a canary so that she could use his feathers for her ingredients.
- Not to be confused with 1959's "Trick or Tweet", which has nothing to do with Halloween.