Two carnies (Sewell and Gugino) abduct a mermaid in Ireland, circa 1900, and decide to transport her to America. As their ship loses its way and heads towards the mythical Forbidden Islands, the mermaid begins to display its deadly side.

In the dusty little town of Furlough in Texas, an animal is slaughtering the cattle and the locals. When the teenager Tommy is killed, their friends Anna Furlough, her Mexican-American boyfriend Miguel Gonzalez, Jill Gillespie and Rosie finds that a Mexican werewolf Chupacabra is the killer and they plot a plan to kill the beast.