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Doctor Man orders the abduction of a boy related to Urashima Taro, in hopes of using his ancestor's memory to find the treasures of the undersea utopia.
Jun must reach a device that will cause a massive volcanic explosion in 6 hours time, but is distracted by Farah in preventing her from reaching that goal quickly.
Shingo encounters a girl who has strange visions of a Mecha-Gigan attacking her town associated with a stone that gives her amazing gifts.
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.