Don Knotts
T.W. Turtle (voice)

George Kennedy
L.B. Mammoth (voice)

John Rhys-Davies
Woolie Mammoth (voice)

Kathy Najimy
Tillie Hippo (voice)

René Auberjonois
Flanigan (voice)

Hal Holbrook
Cranston (voice)

Betty Lou Gerson
Frances (voice)

Dee Bradley Baker
Kong / Additional Voices (voice)

David Johansen
Bus Driver (voice)

Mark Dindal
Max (voice)