Kraab is a cybernetically-enhanced Piscciss Premann and was one of three alien bounty hunters sent by Vilgax to retrieve the Omnitrix from Ben. Kraab was a veteran of the Pyros-Piscciss war, during which he suffered severe injuries, resulting in him having mechanical parts implanted in his damaged body. 95% of his body is now mechanical and 5% is Piscciss Premann.