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)

Butch Hartman