Milo (voice)
Seth Green
Mom (voice)
Joan Cusack
Martian Hatchling (voice)
Ryan Ochoa
Milo (voice) (as Seth Dusky)
Seth Robert Dusky
Martian
Amber Gainey Meade
Two Cats (uncredited)
Dee Bradley Baker
Adam Jennings
Aaron Rapke
Jacquie Barnbrook
Wingnut
Kevin Cahoon
Kirsten Severson
Matthew Henerson
Gribble (voice)
Dan Fogler
Stephen Kearin
Alien (voice)
Breckin Meyer
Ki (voice)
Elisabeth Harnois
Milo's Dad (voice)
Tom Everett Scott
Supervisor (voice)
Mindy Sterling
Martian (voice)
Julene Renee
Raymond Ochoa
Robert Ochoa
Original Music Composer
John Powell
Sound Designer
Randy Thom
Producer
Robert Zemeckis
Casting
Victoria Burrows
Steve Starkey
Book
Berkeley Breathed
Production Design
Doug Chiang
Director
Simon Wells
Screenplay
Stunt Coordinator
Garrett Warren
Writer
Wendy Wells
Art Department Manager
Jason Corgan Brown
Lighting Technician
James Sathre
Animation
Jimmy Almeida
Michael Parks
Lighting Artist
Michael Leung
Yuhon Ng
Steven J. Boyd
Costume Design
Benjamin Feder
Scot Boland
Director of Photography
Robert Presley
Jack Rapke
Editor
Wayne Wahrman