- Steve as Numbuh 1
- Barry as Numbuh 2 (Both are overweight geniuses)
- Debbie Hyman as Numbuh 5
- Hayley as Numbuh 362
- Stan as Numbuh 60
- Roger as The Kid
- Klaus as Numbuh 4
- Scott Tenorman (From South Park) as Heinrich Von Marzipan
- Ben Diskin - Steve Smith
- Cree Summer - Debbie Hyman
- Rachael MacFarlane - Hayley Smith
- Carlos Alazaraqui - Roger
- Dee Bradley Baker - Klaus Heissler and Scott Tenorman
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