- Rigby as Wart/Arthur
- Richard (from The Amazing World of Gumball) as Merlin
- Mordecai as Archimedes
- Benson as Sir Ector
- Rob (from The Amazing World of Gumball) as Sir Kay
- Skips as Sir Pellinore
- Muscle Man as Black Bart the Knight
- Susan as Madam Mim
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