- Emily as Numbuh 5 (Emily and Numbuh 5 are both Intelligent)
- Duck as Heinrich Von Marzipan (I Know Duck is Good)
- Troublesome Trucks as Candy Bandits
- Spencer as Al Sugarh
- James as Numbuh 1 (Cameo)
- Thomas as Numbuh 2 (Cameo)
- Rosie as Numbuh 3 (Cameo)
- Percy as Numbuh 4 (Cameo)
- Cree Summer - Emily
- Dee Bradley Baker - Duck and Percy
- Ben Diskin - James and Thomas
- Lauren Tom - Rosie
- Rob Paulsen - Spencer
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