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Sharktopus is a 2010 SyFy original horror/science fiction film produced by Roger Corman, directed by Declan O'Brien, and starring Eric Roberts. Two official sequels called Sharktopus vs. Pteracuda, which was released on August 2, 2014, and Sharktopus vs. Whalewolf, which premiered on July 19, 2015. Another sequel titled Sharktopus vs. Mermantula, was announced in the credits, and would feature a man/piranha/tarantula hybrid.
The U.S. Navy's special group "Blue Water" builds a half-shark, half-octopus for combat. But the sharktopus escapes and terrorizes the beaches of Puerto Vallarta.
An American scientist up to no good (as usual) by creating the half-pterodactyl, half-barracuda: Pteracuda. When the creature inevitably escapes, it's up to Sharktopus to stop him.
When a mad scientist mixes the genes of a killer whale and a wolf, it creates the Whalewolf, and it's up to Sharktopus to stop it.