Discover
J.D. Daniels
Arnold (voice)

Francesca Marie Smith
Helga (voice)

Justin Shenkarow
Harold (voice)

Jamil Walker Smith
Gerald (voice)

Craig Bartlett
Brainy (voice)

Dan Castellaneta
Grandpa (voice)

Tress MacNeille
Grandma (voice)
Directing

Craig Bartlett
Director
Writing

Tuck Tucker
Storyboard

Craig Bartlett
Writer
Steve Viksten
Writer
Joe Ansolabehere
Writer

Craig Bartlett
Storyboard