- Toby Thompson as Arthur
- Mr. Bill Thompson as David
- Mrs. Jane Thompson as Francine
- Stacey Thompson as Ms. Morgan
- Dr. Noseworthy as Mr. Tingley
- Helvetica Black as Molly
- Colbert "Cole" Black as Pal
- Mr. Carbon Black as Rattles
- Loogie Short as Mr. Ratburn
- Bianca Rodriguez as Jane
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