He was once a member of a race of humanoid cat people of the planet medolight-7 who all lived peaceful carefree lives, until one day when the mad dictator Golem Mori Jita Roat made a deal with the corrupted leader addict Richard Scream. Upon the deal coming to a close Golem army of mass produced bio mechanical soldiers Savagely ripped senjiro's world apart. In the chaos of the planets armageddon Sen was separated by force when an explosion flung him into the air and broke both his legs and wounded most of his body before passing out he saw A thin figure followed by A taller more muscle bound figure. He opened his eyes to pain and terror on a operating table, he saw all his arms and legs where gone, he wanted to scream for help But he couldn't he eventually fainted from fear. He was then reactivated, and reincarnated as a powerful cyborg weapon of unstoppable powers, Golem reprogrammed him to obey his orders no matter the circumstance.