BIOS
D
Dr. Raichi: He survives destruction of his planet which was destroyed by the early Saiyans. He plotted revenge and created a bunch of mutant monsters, including Hatchan, which were all killed by the Saiyan warriors. (Raichi was killed from the Saiyans' fireballs)
Dr. Wheelo: An evil scientist whose laboratory caved in on him. His giant brain was preserved in the ice and he amd his lab were restored by a wish made with the Dragonballs by his Android assistant. He tried to take over Goku's body but was killed by Goku.
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