Many centuries ago, the android Peebo and the Bio Robo came to Earth from the fallen Bio Star. The Bio Robo showered five people with the Bio Particles, which would be passed on to later generations. In the present day, Doctor Man and his Shin Teikoku (New Empire) Gear threaten the world. Peebo must find the descendants of the original Bio Particle-showered five to form the Choudenshi (Super Electronic Squadron) Bioman.