- Hiroya Ishimaru
-  Kôji Kabuto (voice)
- Ai Uchikawa
- Â Sayaka Yumi
- Hiroshi Yanaka
- Â Tetsuya Tsurugi
- Kôsei Tomita
- Â Doctor Hell
- Fumihiko Tachiki
- Â Boss
- Jôji Yanami
- Â Professor Yumi
- Haruko Kitahama
- Â Baron Ashler (voice)
- Hidekatsu Shibata
- Â Baron Ashler (voice)
- Mitsuki Saiga
- Â Jun
- Sayaka Aida
- Â Shiro Kabuto
- Patrick Baker-Benfield
- Â Additional Voices (voice)
- Jose Brown
- Â Additional Voices (voice)
- Martin Burke
- Â Shiro Kabuto (voice)
- Jeff Catlin
- Â Additional Voices (voice)
- Katherine Catmull
- Â Gamia (voice)
- Shaneye Ferrell
- Â Sayaka Yumi (voice)
- Robert Fisher
- Â Additional Voices (voice)
- Lainie Frasier
- Â Baron Ashler (voice)
- William Gambil
- Â Additional Voices (voice)
- Matt Hislope
- Â Mucha (voice)
- Samantha Inoue Harte
- Â Additional Character (voice)
- Nathan James
- Â Additional Voices (voice)
- Brian Jepson
- Â Tetsuya Tsurugi (voice)
- Heather Kafka
- Â Jun (voice)
- Monika Kappe
- Â Additional Voices (voice)
- Robert Ashker Kraft
- Â Baron Ashler (voice) (as Robert Kraft)
- Mark Laskowski
- Â Boss (voice)
- Taylor Maddux
- Â Additional Voices (voice)
- Kôichi Nagano
- Â Professor Sewashi
- Edwin Neal
- Â Professor Morimori (voice) (as Ed Neal)
- Robert Newell
- Â Kouji Kabuto (voice)
- Jason S. Perry
- Â Additional Voices (voice)
- Bill Pfuderer Jr.
- Â Professor Sewashi (voice)
- Kevin Remington
- Â Additional Voices (voice)
- Arthur Ripley
- Â Kazumasa (voice)
- Beto Rodriguez
- Â Additional Voices (voice)
- Homero Sanchez
- Â Additional Voices (voice)
- John Paul Shepard
- Â Doctor Hell (voice)
- Jessica Smolins
- Â Roll, Lorry (voice)
- D.J. Spankus
- Â Professor Nossori (voice)
- Adam Sultan
- Â Additional Voices (voice)
- Hidenari Ugaki
- Â Professor Morimori
- Hideyuki Umezu
- Â Professor Nossori
- Chilimbwe Washington
- Â Additional Voices (voice)
- Ken Webster
- Â Professor Yumi (voice)
- Ryôka Yuzuki
- Â Gamia-Q (voice)
- Christopher Lambert
- Â Additional Voices (voice) (uncredited)
