Mega Shark is the main antagonist of the Mega Shark series. In the movie Mega Shark Versus Crocosaurus, the shark fights off a giant crocodile with the name of Crocosaurus. In Mega Shark Versus Mecha Shark, he fights a replica of himself called Mecha Shark (note: This movie is similar to Godzilla vs Mechagodzilla.) He fights a giant octopus in the movie Mega Shark Versus Giant Octopus. In Mega Shark Versus Kolossus, the shark fights off a giant monstrous robot named Kolossus.
Other Trivia
Mega Shark is shown to be a Megalodon.