When a meteorite falls to Earth two college professors, Dr. Ira Kane and Prof. Harry Phineas Block, are assigned the job of checking the site out. At the site, they discover organisms not of this planet. Soon the site is taken over by the government, forcing Ira and Harry to the side. As the new life-forms begin to evolve and start to get more and more dangerous, it's up to the two professors to save the planet.

The scientist Diana Purlow is performing experiments with the mind of criminals sentenced to death in the prison of the sadistic warden Earl Blakely. She tests an apparatus she developed and capable of read minds in a man that claims to be innocent of a murder, but she is not able to convince her former lover and Governor to call off the execution. When the serial killer Jesse Mowatt is arrested and sentenced to death, she convinces the warden to submit Jesse to her experiment. While working with the murderer, Diana faces pure evil in its essence.

In Miami, the successful lawyer Stacy and her colleague and friend Lauren are enjoying a party promoted by the company where they work when Stacy receives a call from her hometown Venice telling that her sister Kate was murdered. Stacy heads to Venice and meets her former high school mate Bobby in charge of the investigation of the case but without any lead. Stacy meets Kate's employer Roger trying to get some information about her sister since they were distant and without contact for a long time. While in Kate's house, she finds an external HD hidden in her Teddy Bear and she discovers that Kate was a user of a site that promoted encounters for kinky sex; together she finds the address book of her sister with a couple of names. Stacy joins the site and schedules to meet with the guys listed in the address book sure that one of them might be the killer of her sister.