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 Michael Madsen, Natasha Henstridge, Marg Helgenberger, Mykelti Williamson, George Dzundza, James Cromwell and Justin Lazard. In addition to Madsen and Helgenberger reprising their roles, Henstridge also returned for the sequel as a new character. The plot has Patrick Ross, the astronaut son of a senator, 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.

Plot

Commander Patrick Ross leads a human mission to Mars. Soil samples collected by the astronauts contain an alien substance which thaws aboard their capsule and contaminates them, causing a brief contact gap with mission control. The three astronauts return to Earth to public celebration, but an institutionalized former scientist, Dr. Cromwell, reacts to their return with violent panic. The three astronauts are examined and quarantined to prevent them from engaging in sexual intercourse for ten days. However, Patrick disregards the advice and sleeps with two women that night. Both women undergo an accelerated pregnancy in which their stomachs split open and half-alien children emerge, killing them. Patrick hides the rapidly growing alien children in a remote shed.