Seth Green
Milo (voice)
Acting
Joan Cusack
Mom (voice)
Acting
Dan Fogler
Gribble (voice)
Acting
Breckin Meyer
Alien (voice)
Acting
Elisabeth Harnois
Ki (voice)
Acting
Tom Everett Scott
Milo's Dad (voice)
Acting
Mindy Sterling
Supervisor (voice)
Acting
Julene Renee
Martian (voice)
Acting
Raymond Ochoa
Martian Hatchling (voice)
Acting
Robert Ochoa
Martian Hatchling (voice)
Acting
Ryan Ochoa
Martian Hatchling (voice)
Acting
Seth Robert Dusky
Milo (voice) (as Seth Dusky)
Acting
Amber Gainey Meade
Martian
Acting
Dee Bradley Baker
Two Cats (uncredited)
Acting
Adam Jennings
Martian
Acting
Aaron Rapke
Martian
Writing
Jacquie Barnbrook
Martian
Acting
Kevin Cahoon
Wingnut
Acting
Kirsten Severson
Martian
Acting
Matthew Henerson
Martian
Acting
Stephen Kearin
Martian
Acting