Slix Vigma

Slix Vigma is an alien robot that first appeared in Grudge Match. He controlled a spaceship known as the Megacruiser and used it to attract the public to gladiator-like fights. He kidnapped both Kevin and Ben to fight together for him after he observed them fighting on Earth. At the conclusion of Grudge Match, Ben uses Upgrade to overpower him, although it was a little hard to take control of him, leading to Kevin ultimately destroying him.