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