Diamondhead is a Petrosapien from the now destroyed planet Petropia. He is the fourth alien Ben used in the franchise and made his debut in And Then There Were 10 where he defeated a large Drone. He reappeared in Ben 10: Alien Force in the episode Vengeance of Vilgax: Part 2 where he defeated Vilgax after being reborn from Chromastone's remains. He appeared in the Ben 10: Ultimate Alien episode Basic Training where he participated in a training exercise. He reappeared in the Ben 10: Omniverse episode Trouble Helix where he defeated Malware. He was used by teenage Ben in Omniverse in the episode It Was Them where he fended of Slamworm.
He was voiced by Jim Ward in the original series, Dee Bradley Baker in Alien Force and Ultimate Alien and was voiced by Eric Bauza in Omniverse. He is one of the few aliens to appear in every series.
He was voiced by Jim Ward in the original series, Dee Bradley Baker in Alien Force and Ultimate Alien and was voiced by Eric Bauza in Omniverse. He is one of the few aliens to appear in every series.