Originally the brother of Twyla, the Poison Bugblade Clawbeast was captured and enslaved by Planet Doom. He made a deal with Zarkon that if he allowed himself to become a robeast and defeat voltron, in exchange Doom would free him, his sister, and the other slaves. The result was a barely humanoid cyclopean Robeast with long claws and a flail weapon. Yurak beamed him down to attack Arus's cities. Hunk tried to reason with it to no avail (the beast seemed to have lost its human sentience). With no other choice, Voltron was formed and destroyed the Robeast.