Species II is a 1998 American science fiction horror thriller film directed by Peter Medak. The film is a sequel to Species (1995) and the second installment in the Species series. The film stars Natasha Henstridge, Michael Madsen, and Marg Helgenberger, all of whom reprise their roles from the first film. The plot has Patrick Ross (Justin Lazard), the astronaut son of a senator (James Cromwell), being infected by an extraterrestrial organism during a mission to Mars and causing the deaths of many women upon his return. To stop him, the scientists who created the human-extraterrestrial hybrid Sil in the original Species try using a more docile clone of hers, Eve (Henstridge).

Plot

Commander Patrick Ross leads a manned mission to Mars. Soil samples collected by Patrick's team of astronauts unwittingly contain an alien-based substance which thaws aboard their capsule due to the temperature difference and contaminates them, causing a seven-minute contact gap with mission control. With seemingly no subsequent negative effects, the astronauts return to Earth to public celebration. Only an institutionalized former scientist, Dr. Cromwell, reacts to their return with violent panic. Meanwhile, Dr. Laura Baker has created a clone of Sil named Eve, whose alien DNA is suppressed to make her more docile. Her team conducts experiments on Eve, hoping to find a way to combat the alien species should it ever return to Earth. Every experiment is unsuccessful as Eve's biology adapts.