The Halloween season has come round again. Bulldog is bathed in glory after playing a practical joke on Frasier by replacing his BMW with a replica that had been smashed up. Frasier is humiliated and determined to get his revenge. His initial plan, which involves using a red balloon to cause Bulldog gradual psychological distress, meets with scorn when he explains it to Roz. He then decides to set up a terrifying scene in the KACL basement where Bulldog is working now, involving actors dressed as zombies. Martin and Roz help with the preparations, but they both agree that practical jokes are not Frasier's strong point, so this is bound to fail. After some thought, Frasier realises one way in which he can stage the greatest practical joke ever, even if it means changing direction in his plan. Meanwhile, Gertrude Moon challenges a child named Jason (who was also the main trick-or-treater, in Frasier's building in past seasons) who comes to Niles' apartment trick-or-treating. This leads to a childish prank war between the two; when Niles, Daphne, and Jason's parents step in, though, the two team up to play jokes on them.