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Mika's pursuit of a lead when a Mecha-Gigan crash lands near a mountain leads her into a confrontation with Farah over a plot connected with a trap by Gear to stop Bio Robo.
In order to discourage people from indulging in a rain of coins created by an invisible Mecha Gigan controlled by Monster, Shingo decides to become a bad criminal to get the means to stop it.
When Peebo discovers a letter from a friend from Bio, it inspires Doctor Man to start a plot involving making the robot believe that his friend has returned after 500 years.
Many centuries ago, the android Peebo and the BioRobo came to Earth from the fallen Bio Star. The BioRobo 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.