A rich, beautiful couple give birth to deformed alien twins who, when their heads are together, are the smartest kids on the planet.
Jerry Lewis
as Wilbur Swain / Caleb Swain
Madeline Kahn
as Eliza Swain / Lutetia Swain
Marty Feldman
as Sylvester
Jim Backus
as President of the U.S.
Merv Griffin
as Anchorma
Pat Morita
as Ah Fong, the Chinese Ambassador
Orson Welles
as Aliens' Father (voice)
John Abbott
as Dr. Frankenstein
Samuel Fuller
as Colonel Sharp
