Crystalfist is a Mutant Subsapian Hybrid and one of aliens in the Antitrix. He is a counterpart of Diamondhead in the 2016 Ben 10 series.
Ben 10 (2016)
Crystalfist first appeared in where Kevin Levin turned into him to fight against Ben Tennyson as Humungousaur, to defend himself after noticing that Ben was not willing to talk to him. He later turned into Bootleg to scare Ben.
Crystalfist also appeared in the episode I Don't Like You, where Kevin turned into him to show off in a cooking show for the internet against Ben.
In the episode Roundabout: Part 2, where Kevin turned into him to fight against Forever Knight and help Ben and Gwen, only to presumably be stuck in time.
In the episode Bottomless Ben, Kevin turned into Crystalfist after turning back from Bashmouth to help Ben and a Part Ranger to fight against a rough minor and possibly left.
Crystalfist made an appearance in the episode Tales from the Omnitrix in a vision, where Ben, Gwen and Max were telling each other tales about fighting against Kevin.
Crystalfist made an appearance in Ben 10 versus the Universe: The Movie, where Kevin would turn into him to fight against and possibly escape Vilgax.
Crystalfist also appears in the video game Ben 10 Power Trip, where Kevin would use him to help Ben fight against Hex and Lord Decibel.
- Crystalfist is the second major Petrosapien seen, the first is Diamond Matter.
- It can be interpenetrated by the names of both Crystalfist and Diamond Head, that the two represent Brains versus Brawns.