- Gumball as Mike
- Mr. Robinson as Sulley
- Banana Joe as Don Carlton
- Tobias as Art
- Darwin as Squishy
- Tim and Stuart as Terri Perry and Terry Perry
- Mr. Small as Professor Knight
- Richard as Brock Pearson
- Penny as Carrie Willams
- Penny's Sister as Brittany Davis
- Nicole as Taylor Holobrook
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