All Cast

Seth Green

Seth Green

Milo (voice)

Joan Cusack

Joan Cusack

Mom (voice)

Dan Fogler

Dan Fogler

Gribble (voice)

Breckin Meyer

Breckin Meyer

Alien (voice)

Elisabeth Harnois

Elisabeth Harnois

Ki (voice)

Tom Everett Scott

Tom Everett Scott

Milo's Dad (voice)

Mindy Sterling

Mindy Sterling

Supervisor (voice)

Julene Renee

Julene Renee

Martian (voice)

Raymond Ochoa

Raymond Ochoa

Martian Hatchling (voice)

Robert Ochoa

Robert Ochoa

Martian Hatchling (voice)

Ryan Ochoa

Ryan Ochoa

Martian Hatchling (voice)

Seth Robert Dusky

Seth Robert Dusky

Milo (voice) (as Seth Dusky)

Amber Gainey Meade

Amber Gainey Meade

Martian

Dee Bradley Baker

Dee Bradley Baker

Two Cats (uncredited)

Adam Jennings

Adam Jennings

Martian

Aaron Rapke

Aaron Rapke

Martian

Jacquie Barnbrook

Jacquie Barnbrook

Martian

Kevin Cahoon

Kevin Cahoon

Wingnut

Kirsten Severson

Kirsten Severson

Martian

Matthew Henerson

Matthew Henerson

Martian

Stephen Kearin

Stephen Kearin

Martian