| Seiyuu | Role |
| Hidenobu Kiuchi | Kenzou Tenma |
| Tomokazu Seki | Karl Neumann |
| Takayuki Sugou | Dr. Gielen |
| Ichirou Nagai | Dr. Reichwein |
| Junko Takeuchi | Dieter |
| Kyoko Hikami | Lotte Frank |
| Nozomu Sasaki | Johann |
| Tsutomu Isobe | Runge |
| Mamiko Noto | Nina |
| Mami Koyama | Eva Heinemann |
| Hiroaki Hirata | Lipsky (Episode 56 & 57) |
| Akemi Okamura | Tomasz (Episode 42) |
| Akemi Okamura | Anna (Episode 41) |
| Rie Ishizuka | Antonin (Episode 41, 42, 44, 49) |
| Chikao Ohtsuka | Petrov (Episode 40 & 41) |
| Hideyuki Tanaka | Grimer (Episode 40 - 42, 44 - 51) |
| Toshihiko Nakajima | Kaufman (Episode 36 & 39) |
| Ken Yamaguchi | Iwai (Episode 35) |
| Yousuke Akimoto | Mauler (Episode 6 & 7) |
| Chika Sakamoto | Martin (Episode 33) |
| Eiji Hanawa | Constantin (Episode 25 & 32) |
| Hisayoshi Suganuma | Detective Suk (Episode 43 - 46, 48, 50, 51) |
| Tomomichi Nishimura | Chief Batera (Episode 43) |
| Masaaki Tsukada | Farobeck (Episode 43) |
| Romi Paku | Helene (Episode 54) |
| Shuichi Ikeda | Martin (Episode 58) |
| Wataru Takagi | Gustav (Episode 54) |
| Shigeru Chiba | Milch (Episode 52 - 54) |
| Ryusuke Ohbayashi | Vardeman (Episode 52, 53, 55 - 57) |
| Shouzou Iizuka | Zoback (Episode 50) |
| Junko Noda | Moharu (Episode 49) |
| Banjou Ginga | Rosso (Episode 18) |
| Unsho Ishizuka | Yarka (Episode 47) |
| Katsunosuke Hori | Chief Nebela (Episode 45 & 48) |
| Haruhi Terada | Idi (Episode 44) |
| Takaya Hashi | Tulunka (Episode 44, 47, 49) |
| Tomoko Kaneda | Rosemarie (Episode 29 & 30) |
| Motomu Kiyokawa | Liebert (Episode 29 & 35) |
| Tamio Ohki | Nina's Father (Episode 5 & 6) |
| Mitsuru Miyamoto | Heinz (Episode 13 & 51) |
| Katsuhisa Houki | Messner (Episode 7 & 15) |
| Eiji Hanawa | Peter (Episode 5) |
| Takehiro Murozono | Junkers (Episode 3, 4, 8, Extra 1, 37) |
| Shiho Kawaragi | Beate (Episode 5 & 6) |
| Shintarou Oohata | Otto (Episode 5) |
| Kinryu Arimoto | Gross (Episode 10) |
| Tomohiro Nishimura | Karl (Episode 10) |
| Yasuyuki Kase | Eimer (Episode 5) |
| Mitsuaki Madono | Dr. Norden (Episode 2, 3, 8) |
| Hiroshi Yanaka | Dr. Eisen (Episode 1, 2, 8, Extra 1) |
| Masahiko Tanaka | Dr. Boyer (Episode 1, 2, 8, Extra 1) |
| Masaaki Tsukada | Hors (Episode 8) |
| Ikuya Sawaki | Mintag (Episode 14) |
| Hikaru Tokita | Karl Neumann (as a child Episode 25, 27, 38) |
| Atsuko Tanaka | Margott (Episode 25, 27, 38, 51) |
| Yukari Nozawa | Nina's Mother (Episode 5 & 6) |
| Unsho Ishizuka | Narration (Extra 1) |
| Takeshi Aono | Heitmaier (Episode 24) |
| Ikuko Tani | Petra (Episode 13 & 51) |
| Junko Noda | Fritz (Episode 21) |
| Rei Sakuma | Barbera (Episode 21) |
| Rikiya Koyama | Jürgens (Episode 19 & 29) |
| Aya Ishizu | Runge's Daughter (Episode 14 & 35) |
| Kumiko Takizawa | Aishe (Episode 15 & 16) |
| Iemasa Kayumi | Goedelitz (Episode 15) |
| Yuuko Sasamoto | Tun (Episode 62 & 65) |
| Sayuri Sadaoka | Martin's Mother (Episode 59) |