Fourth installment of the successful 'Species' franchise. Waking up from a blackout surrounded by mutilated bodies, college professor Miranda Hollander (Helena Mattsson) realises something is wrong. Seeking an explanation from her uncle, she learns the horrifying truth that she is in fact the result of a cloning of human and alien DNA. Travelling to Mexico to confront the scientist responsible, she soon becomes the target of a stream of ravenous mutants. But with her biological clock ticking, Miranda's alien instincts are about to raise their ugly head, resulting in a battle, the type of which, the earth has never seen.