Five descendants of the people showered with Bio Particles by Bio Robots five centuries in the past have become Biomen. They transform with the Bio Brace and fight using their Super Electronic Brains on their masks. Their Bioswords are equipped with sword and gun modes.

casts

Ryōsuke Sakamoto

Naoto Ôta

Akito Osuga

Sumiko Tanaka

Michiko Makino