Kraab

From Wikitrix

Kraab is one of three alien bounty hunters sent to take the Omnitrix from Ben. He has gold-colored armor, a sideways mouth, four scythe-like legs, and a large, powerful pincer on his left hand. Within the pincer is a power blaster combined with a chemical sprayer. He can also use his legs to burrow under the ground and travel quickly from place to place.

Kraab is an experienced bounty hunter and is smart enough to know of a chemical spray that takes away Ghostfreak's power to become intangible. It should also be noted that Kraab talks like an actual hunter, calling Ben his "prey", and saying that he is "hardly worth the hunt". However, Kraab is more robotic than organic, meaning Ben, as Grey Matter, can easily deactivate him. Kraab appears in the episode "Hunted".