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Doctor Man adds his 17-year old son to Gear as its new commander, with a cruelty that Ryuta believes can be stopped.
Shingo encounters a girl who has strange visions of a Mecha-Gigan attacking her town associated with a stone that gives her amazing gifts.
As the Bioman try to figure out how to deal with Prince and his Grotes Canth, Ryuta tries to discover how to relate his own experiences in hopes of dealing with Doctor Man's son.
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.