Wayne Knight as Jack O'Lantern
Episodes 1
Billy and Mandy's Jacked Up Halloween
Season Finale
October 31, 2003
2x26
Billy, Mandy and Grim go trick-or-treating for Halloween, and Irwin is left behind because he needs a scarier costume. After pulling a trick on an old lady, and getting some candies, Grim tells the story of why people pull pranks, which he was partially responsible for.
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