An astronaut gets infected with alien DNA during the first mission on Mars and runs amok on earth. Preston and Laura team up with a peaceful, genetically re-engineered Sil to track the monster down.

A group of scientists try to track down and trap a killer alien seductress before she successfully mates with a human.

Taylor is forced to hide the young daughter of a Colombian woman in witness protection who will be testifying against a powerful drug cartel in Federal Court, as ruthless sicarios aim to hunt them down.