An eight-tentacled nightmare hybrid of shark and octopus, "S-11" was created by genetic scientist Nathan Sands as the U.S. Navy's next super-weapon. But when its control implants are damaged during a training experiment off the Mexican coast, the beast escapes to Puerto Vallarta to sample the local fare -- bikini babes, jet-skiers, and spring-breakers. With the ocean terror now out of control and seemingly invincible, a ragtag group -- comprised of a hotshot mercenary, an investigative reporter, and Sand's biomechanical engineer daughter -- have come together to stop the unholy beast from turning a seaside tourist resort into the ultimate human buffet.