- Gumball Watterson as Princeton
- Penny Fitzgerald as Kate Monster
- Mr. Robinson as Rod
- Banana Joe as Nicky
- Richard Watterson as Brian
- Nicole Watterson as Christmas Eve
- Darwin Watterson as Gary Coleman
- Principal Brown as Trekkie Monster
- Anais Watterson as Lucy
- Tobias Wilson as Blue Bear
- Rachel Wilson as Yellow Bear
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