The last we saw of Metalshark Bro, dude was transformed back into a regular shark that swam off into the sunset. It was a classic revenge mission: he killed A LOT of people, got the giant floating eyeball, ate a lot of grub, and defeated Satan's nephew. Unfortunately, this victory was short-lived. A demon hamster kidnapped his bestie, so now he's forced out of his sharky-sabbatical to fight off Cthulhu dudes, mutant alligators, magic demons, and his own aggression.