Dr. Raichi is the main antagonist of the OVA special Gaiden: Saiyajin Zetsumetsu Keikaku. In the Tuffles' prime, he was the greatest scientist of their civilization. Eventually the Saiyans not only massacred the entire Tuffle race, but also stole their technology and conquered the planet, renaming it Planet Vegeta in honor of their king. Raichi made a desperate attempt to escape with his most esteemed invention, Hachihyaku, but was killed as his capsule prepared for liftoff. The capsule found refuge on the Dark Planet, a world at the end of the universe, where Hachihyaku continued incubating until it conceived the "ghost warriors," among them a renewed Dr. Raichi, whose only wish is to eradicate the last remaining Saiyans.

The scientist releases Destron Gas on Earth, which disturbs the Z Fighters concentration in using ki attacks. They defeat the demons that guard the Destron generators, then ghost warriors of past villains appear to attack. This is all part of his plan to lure Goku, Gohan, Trunks and Vegeta (the last remaining Saiyans) to the Dark Planet. Once on there, they battle Dr. Raichi, whose only attack is barrier, and destroy him. After Raichi rematerializes, Vegeta destroys him once again.

From Dragon Ball Wiki, a Wikia wiki.

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