The once prosperous Bio Star is destroyed after a war erupted over the use of a scientific discovery called "Bio Particles". The Bio Star Peacekeeping Alliance (バイオ星平和連合 Baio-sei Heiwa Rengō?), which sought to use the Bio Particles for peaceful purposes, sends the giant robot Bio Robo and an assistant robot named Peebo in order to prevent the same tragedy from happening on Earth. The Bio Robo arrives on 15th century Japan, where it showers the Bio Particles on five young individuals. Five hundred years later, the descendants of these individuals, having inherited the Bio Particles from their ancestors, are chosen by Peebo to become the Bioman team in order to protect the Earth from the Neo Gear Empire, an organization led by the mad scientist Doctor Man.

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Episode51