|This article is about a/an actor in the TV special Birth of the 10th! Kamen Riders All Together!!.|
Hajime Kaido (海堂 肇 Kaidō Hajime) is Ryo Murasame's father's friend, and the researcher of the biochemistry which is also the teacher of a university. He cooperates in Ryo unstintingly.
Behind the scenes
Dr. Hajime Kaidō was played by Eiji Karasawa (柄沢 英二 Karasawa Eiji).
- Birth of the 10th! Kamen Riders All Together!!
- Kamen Rider 1 Through RX: Big Gathering (archive footage only)