Due to the fact that this was The '70s, the voice actor pool was smaller than it is now. As a result, Acting for Two is frequent in the anime's foreign dubs, particularly the European-language ones.
Original version
- Noriko Ohara voices Katherine Rii and Hiyoshi Go.
- Hiroshi Masuoka voices Zuhl, Commander Oka and the grey-haired Aristocrat that taunts Heinel from the series finale.
- Tamio Ohki voices Kozo Sakonji and Marquis Zaki.
- Seizo Kato voices Professor Hamaguchi and Doyle.
- Yusaku Yura voices Ippei's father, Beast Knight Gardo, Beast Knight Neegu, Beast Knight Gamenza, Beast Knight Gongoru, Beast Knight Zoru, Beast Knight Sazaras, Beast Knight Kameguria and Beast Knight Girion.
Italian dub
- Valeriano Leo voices Kenichi Go, Commander Oka, Prince Heinel, Zaki, General Oka, Kentaro Go and the Narrator from episodes 1-26.
- Pescucci Gastone voices Jangal Rui and Daijirou Go.
- Cosolo Carlo voices La Gohl, Prince Heinel, and Kenichi Go after Valeriano Leo's departure, Daijirou Go and Jangal Rui after Gastone's departure, and the Narrator in Episodes 38, 39 and 40.
- Allegrini Carlo voices Professor Hamaguchi, Ippei Mine, Beast Fighter Prozar and Zuhl.
- Andreini Gabriella voices Mitsuyo and Hiyoshi Go.
Greek dub
- Ilias Plakidis voices both Ippei and Heinel.
- George Mazis voices Daijirou, Kentaro, Professor Hamaguchi, Professor Sakonji, General Oka and Zuhl.
- Matina Karras voices Hiyoshi, Mitsuyo, Katherine and Megumi. Later, Katerina Petousi voiced Hiyoshi, Katherine and Megumi.
Cuban Spanish dub
- Katherine and Mitsuyo were both voiced by Eslinda Núñez. She described
voicing them both "as a beautiful experience".
Philippine English dub
- Earl Palma voices Kenichi, Jangal, and Doyle.
- Joonee Gamboa voices Professor Hamaguchi, Professor Sakaonji and Zaki.
- Dodo Crisol voices Heinel, Professor Hamaguchi, and General Dange.
- Cris Vertido voices Zambajil and Zuhl.
- Chito Vicente voices General Oka and Jangal after Palma's departure.
Korean dub
- Min Noh voices Ippei Mine, Daijiro Go, General Oka and Prince Heinel.
- Won Hwang voices Professor Hamaguchi and Jangal Rui.
- Seongho Shin voices Ippei Mine and Prince Heinel, but strangely, Daijiro Go and General Oka retain Min Noh as a voice actor.
