Shredder prefers Ninjas for his operations due to their skills, but there are times when only a low-level thug can get a job done. Shredder finds the perfect candidate in a prison in São Paolo: Xever. As long as Shredder pays, Xever does what he's told. He is angry, tough, and cruel, and his sole focus is the pursuit of money.

After being exposed to the Kraang's mutagen bomb, Xever transforms into Fishface, a fierce mutant that employs robotic legs and air-breathing apparatus to stay on land.