When a woman has a sexual encounter with an alien, she finds her DNA altered and starts experiencing a dangerous transformation. As she struggles to control her newfound abilities, a group of scientists and government agents tries to capture her for their own sinister purposes.

In the sequel to Species, an astronaut is infected with alien DNA while on a mission to Mars. He returns to Earth and starts a killing spree, transforming into a deadly sexual predator. A team of scientists and mercenaries must race against time to stop him before he can mate and create a new species.

In Species III, a pregnant alien hybrid escapes a laboratory and goes on a mission to save herself and the world from a deadly virus. Along the way, she must confront her own instincts and the military who want to capture her. With her unique abilities, she becomes a quick learner and a formidable opponent to anyone who tries to stop her.

In 'Species,' a group of scientists creates a female alien-human hybrid. When she escapes, they must find a way to stop her before she destroys humanity. The movie explores themes of genetic engineering, alien DNA, and interspecies sex.