A huge alien spacecraft has landed on Manhattan Island, directly in Central Park. NYPD Swat Team Sergeant Harris, along with every other available police officer, and his team have been called just in case they may become necessary.Then the huge ship opens and the first wave of alien monsters are released with the sole intention of eating their way through every life form on planet Earth!The Sergeant and his team are forced to fight their way to where their families are waiting and then attempt to flee the city while the huge ship spews wave after wave of fresh monsters into the city.