|This article is about a/an planet in Choudenshi Bioman.|
The once prosperous Bio Star (バイオ星 Baio-sei?) was destroyed after a world war erupted over the use of a scientific discovery called "Bio Particles". The Bio Star Peacekeeping Alliance, which sought to use 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. Bio Robo arrived in 15th century Japan, where it showered Bio Particles on five young individuals. Five centuries later, the descendants of these individuals, infused with Bio Particles, are chosen by Peebo and Bio Robo to become the Bioman team in order to protect the Earth from the Neo Empire Gear, an organization led by the mad scientist Doctor Man.