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J.D. Daniels as Arnold (voice) |
 |
Francesca Marie Smith as Helga (voice) |
 |
Justin Shenkarow as Harold (voice) |
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Jamil Walker Smith as Gerald (voice) |
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Craig Bartlett as Brainy (voice) |
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Dan Castellaneta as Grandpa (voice) |
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Tress MacNeille as Grandma (voice) |
| Writing | Craig Bartlett | Writer |
| Directing | Craig Bartlett | Director |
| Writing | Joe Ansolabehere | Writer |
| Writing | Steve Viksten | Writer |
| Writing | Craig Bartlett | Storyboard |
| Writing | Tuck Tucker | Storyboard |
