- Shioli Kutsuna
- Neri
- Brando Austin
- Additional Voices
- Lowell Bartholomee
- Redbeard
- Charles C. Campbell
- Director Pennen
- Jason Douglas
- Redbeard's Father
- Akira Emoto
- Dr. Kubo
- Ryûzô Hayashi
- Father
- Shôzô Hayashiya
- Red Beard
- Tamiyo Kusakari
- Mother
- Edwin Neal
- Professor Kubo
- Shun Oguri
- Gusko Budori
- Monica Rial
- Neri / Budori's Mother / Redbeard's Wife (voice)
- Kuranosuke Sasaki
- Kidnapper
- Derick Snow
- Budori Guskou
- Christopher Wehkamp
- Silk Factory Owner
