- Numbuh 1 as Mr. Harman
- Monty Uno as Mr. Rumbold
- Joe Balooka as Mr. Grainger
- Numbuh 60 as Captain Peacock
- The Kid as Mr. Lucas
- Numbuh 4 as Mr. Humphries
- Numbuh 3 as Mr. Rumbold's Secretary
- Heinrich Von Marzipan as Mr. Mash
- Numbuh 5 as Miss Ainsworth
- Cree Lincoln as Mrs. Slocomb
- Numbuh 362 as Miss Brahms
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