The Wild Thornberrys: The Origin of Donnie

Betty White

Grandma Sophie (voice)

Alan Henry Brown

Sri Mayasandra (voice)

Arthur Burghardt

Rhino / Monkey (voice)

Cara DeLizia

Baru / Monkey (voice)

Moira Quirk

Rehabilitation Worker / Monkey (voice)

Dwight Schultz

Badouk / Monkey / Poacher (voice)