Cannonbolt

He is Other Alien not in 1st ten

His large size and stubby arms and legs make Cannonbolt clumsy at first, but when he curls up within the thick armor on his back he becomes an unstoppable wrecking ball! While rolled-up he can launch himself at high speeds and ricochet off solid objects to cause massive damage. Cannonbolt is a Arburian Pelarota from planet Arburia. Being like a cannon ball, he can roll up into an invulnerable ball to attack his enemies. Beforehand, while out of this form, he is extremely vulnerable, being very clumsy. He has claws on each of his hands, and was the only alien of Ben's arsenal that could defeat The Great One. After defeating the Great One, he was briefly worshipped by thing Great One's worshippers, but then turned back into Ben. He was obtained at Yellowstone Park. Ben unlocked Cannonbolt after he fought with Kevin 11, so Cannonbolt was unknown to Kevin until the episode Grudge Match.