Dr. Hajime Kaido

Dr. Hajime Kaido (海堂 肇博士) - He is Ryo's father's friend and is the researcher of the biochemistry which is also the teacher of a university. He cooperates in Ryō unstintingly.

Portrayal
Dr. Hajime Kaidō was played by Eiji Karasawa (柄沢 英二).

Appearances

 * Icon-zx.png Birth of the 10th! Kamen Riders All Together!!
 * Icon-rx.png Kamen Rider 1 Through RX: Big Gathering