A large robot that has large amounts of strength and can fire lasers from hands. In the fight Gwen cut off it's hand to save Kevin and before it can react, Ben as Goop enters it through small spaces then proceeded to enlarge himself creating large amounts of pressure which in turn causes the large robot to explode causing a rain of Goop to fall. When the hand Gwen cut off it worn as a Gauntlet by Cash it allows the robot to take over Cash returning to the form it held before Ben and company interfered. When it gains enough control over Cash it "forces" him to attempt to kill Ben out of revenge.Considering how angry Cash was at Ben beforehand over Ben sticking up to him it wouldn't have been very hard to cause him to do this. After fighting with Chromastone in the Mr. Smoothy Smoothie Shop parking lot Ben manages to reach Cash just in time to save him.
The Gauntlet Robot has only made one appearance in Ben 10 Alien Force.

Gauntlet Robot's First Appearance
The Gauntlet (Episode)

Gauntlet Robot's Last Appearance
The Gauntlet (Episode)