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Hikaru and Jun become trapped in a seaside town conquered by an army of mechanical spiders that control the populace.
As Doctor Man continues to pursue his son to join him, Shuichi receives a mysterious contact from his mother that leads to the revelation to him and Bioman of the truth regarding Gear's leader.
Realizing the trouble of Gear being ruled by a human, the Big Three decide to assassinate Doctor Man, leading to a loyal Mechaclone to try and reach a weapon in hopes of dealing with them.
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.