• 
  Jennifer Beals

  Inkar (voce - engleză)
• 
  Banjô Ginga

  Marui (voice)
• 
  Takahiro Fujiwara

  Takamine (voice)
• 
  Dylan McDermott

  Yoake Suguru (voce)
• 
  Josh Keaton

  Ray (voice)
• 
  Tom Kenny

  Ummo Alien
• 
  Yuri Lowenthal

  Tyler (voice)
• 
  Daisuke Namikawa

  Professor Yoake (voice)

• 
  Fred Tatasciore

  Reptilian (voice)
• 
  Yutaka Nakano

  Tokuo Yanase / Principal (voice)
• 
  Roger Craig Smith

  Eisuke (voice)
• 
  Wataru Hatano

  Eisuke (voice)
• 
  Tetsuya Kakihara

  Tyler (voice)
• 
  Hisako Kanemoto

  Halle (voice)
• 
  Asami Seto

  Anna (voice)

• 
  Beau Billingslea

  Goat Alien (voice)
• 
  Dorothy Elias-Fahn

  Additional Voices (voice) (as Dorothy Fahn)
• 
  Issei Futamata

  Ummite (voice)
• 
  Hiroshi Shirokuma

  Goat Type Alien (voice)
• 
  Ryôta Ôsaka

  Ray (voice)
• 
  Haruka Chisuga

  Natsumi (voice)
• 
  Ray Chase

  Additional Voices (voice)