Original: Dragon Ball Z manga , volume 11 , chapter 131 Mecha Frieza Physically ruined while caught in Planet Namek 's explosion after Goku defeats him , what remained of the still-living Frieza was salvaged and rebuilt with cybernetic enhancements by scientists under the order of King Cold .
Simplified: Mecha Frieza Physically ruined while caught in the Planet Namek 's explosion after his defeat , what remained of the still-living Frieza was salvaged and rebuilt with cybernetic enhancements by scientists under the order of King Cold .