Grim for a Day

After a lousy night for Grim, Billy and Grim argue about who has the hardest time, the kid or the Reaper of Souls. Mandy proposes they switch places for the day to find out. Then, Grim seems to be having a good time, acting like a silly kid, while Billy is bored waiting for his old victim, Mr. Voorhees, to open the door. In the end, Billy transforms into a short skeleton, while Grim transforms into a taller version of Billy.

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S02E22 - Chicken Ball Z