Rob Paulsen
— Gramps / Pilot / Mule (voice)
Kath Soucie
— Girl / Alien Kid 1 (voice)
Christine Cavanaugh
— Boy / Alien Kid 2 (voice)
Charlie Adler
— Wimpy Alien / Alien Dad / Terrified Man / Alien Grandpa (voice)
Julianne Elizabeth Davis
— President (voice)
Neil Dickson
— Alien Leader / Sphinx (voice)