Tetrax Shard is an alien bounty hunter from the planet Petropia, originally hired by Vilgax to retrieve the Omnitrix, but is now a trusted friend and ally of Ben Tennyson. As a member of the Petrosapien Race, he has the power to create and grow green crystals to use as weapons, shields, and projectiles. He also has a variety of weapons on his belt and a hoverboard on it too.