Arnold

J.D. Daniels

Arnold (voice)

Francesca Marie Smith

Helga (voice)

Justin Shenkarow

Harold (voice)

Jamil Walker Smith

Gerald (voice)

Craig Bartlett

Brainy (voice)

丹·卡斯泰兰尼塔

Grandpa (voice)

特蕾丝·麦克尼尔

Grandma (voice)