The Costumes Are A-Changin'

 is a Halloween episode of The Grim Adventures of Billy, Mandy, Felicity, and Toby.

Summary
Everyone in Endsville turn into whatever costume they're wearing and are now cursed by a broken amulet.

Cast

 * Greg Eagles as Grim
 * Richard Steven Horvitz as Billy
 * Grey DeLisle as Mandy
 * Eden Sher as Felicity
 * Max Charles as Toby
 * Laura Bailey as Kaitlyn
 * Kate Miccuci as Brielle
 * Phil LaMarr as Declan
 * Ashley Johnson as Sonnet

Transcript
The Costumes Are A-Changin'/Transcript

Trivia

 * Costumes:
 * Felicity - Vampire
 * Kaitlyn - 18th Century princess
 * Brielle - Goth Lolita
 * Sonnet - Leopard girl
 * Declan - werewolf