- Caillou as Arthur
- Rosie as D.W.
- Leo as Buster
- Baby Rosie (From Big Brother Caillou) as Baby Kate
- Caillou's Daddy as Arthur's Dad
- Caillou's Mommy as Arthur's Mom
- Clementine as Francine
- Jason and Jeffery as Timmy and Tommy Tibbles
- Sarah as Muffy
And Many More
- Bubble Guupies/Arthur
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