Caillou and Rosie gets ready for Halloween, but Rosie bails out in the last minute because she is suddenly reminded on how she used to hate clowns by her costme, leaving Caillou to go out with daddy. Caillou meets up with Leo and Clementine, and they go around the neighbourhood trick-or-treating together. They all then go over to Caillou's place. The end.
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