Full cast - Guyver: Bio-Booster Armor (OVA) (episodes 1 to 6)

• 1. Genesis of the Guyver

  Recurring: Bob Sessions (Mr. Makishima), David Hart (Narrator), Debra Jean Rogers (Mizusawa), Melissa Charles (Mizuki Segawa), Raymond Garcia (Aota), Yutaka Maseba (Yamamoto)

  Episodic: Bill Kestin (Vamour), Gary Michaels (Lisker), Steve Blum (Gregol), Tom Charles (Molmot)

  Incidental: Dougary Grant (Zoanoid Team Member)

  Unidentified roles: Nakanishi

• 2. The Battle of the Two Guyvers

  Recurring: Bob Sessions (Mr. Makishima), David Hart (Narrator), Debra Jean Rogers (Mizusawa), Melissa Charles (Mizuki Segawa)

  Episodic: David Hart (Lisker's Henchman), Gary Michaels (Lisker)

• 3. Mysterious Shadow-Guyver III

  Recurring: Bill Kestin (Rehalt Guou), Bob Sessions (Mr. Makishima), David Hart (Narrator), Debra Jean Rogers (Natsuki), Melissa Charles (Mizuki Segawa), Raymond Garcia (Aota), Yutaka Maseba (Yamamoto)

  Incidental: Steve Blum (Custodian)

  Unidentified roles: Nakanishi, Zerbubuse

• 4. Attack of the Hyper Zoanoid Team Five

  Recurring: Bill Kestin (Rehalt Guou), David Hart (Narrator), Debra Jean Rogers (Natsuki, Mizusawa), Gary Michaels (Zektor), Melissa Charles (Mizuki Segawa), Raymond Garcia (Aota), Yutaka Maseba (Yamamoto)

  Episodic: Dan Martin (Darzerb, Takasato), Martin Ferguson (Elegen)

  Incidental: Steve Blum (Zancrus)

  Unidentified roles: Nakanishi, Gaster

• 5. The Death of the Guyver

  Recurring: Bill Kestin (Rehalt Guou), Bob Sessions (Mr. Makishima), David Hart (Narrator), Debra Jean Rogers (Natsuki, Mizusawa), Gary Michaels (Zektor), Melissa Charles (Mizuki Segawa), Raymond Garcia (Aota), Yutaka Maseba (Yamamoto)

  Episodic: Dan Martin (Darzerb), Lee West (Scientist), Martin Ferguson (Elegen)

  Incidental: Mimi Davies (Newscaster)

• 6. Terminal Battle! The Fall of Chronos Japan

  Recurring: Bill Kestin (Rehalt Guou), David Hart (Narrator), Gary Michaels (Zektor), Melissa Charles (Mizuki Segawa)

  Episodic: Dan Martin (Darzerb), Lee West (Scientist), Martin Ferguson (Elegen)

  Incidental: Dougary Grant (Guard)