Dr. Hajime Kaido

is a friend of Ryo Murasame's father, and the researcher of the biochemistry which is also the teacher of a university. He cooperates in Ryo unstintingly. 
==Behind the scenes==
===Portrayal===
Dr. Hajime Kaidō was played by .
==Appearances==
* Birth of the 10th! Kamen Riders All Together!!
* Kamen Rider 1 Through RX: Big Gathering 
Category:Kamen Rider ZX
Category:ZX Characters
Category:Allies
Category:Civilian
Category:Kamen Rider Spirits