Species II (a.k.a Species 2: Offspring and Species 2: Origins) is a 1998 sequel to the 1995 film Species. It stars Natasha Henstridge, Michael Madsen and Marg Helgenberger, all of whom reprise their roles from the first film. It also features actor James Cromwell as "Senator Judson Ross".
Roughly two years after the events of Species, an American space mission lands on Mars, and collects soil samples. Back on board, the temperature on the ship thaws out frozen DNA in the soil samples, which then attempts to infect the astronauts. The mission safely returns to earth to universal cheering. Only Dr. Cromwell, a scientist and now an inmate in an asylum, reacts to their return with violent fits.
After their return, the three astronauts are examined and quarantined not to engage in sexual intercourse for ten days. However, one of the astronauts - Patrick Ross - immediately disregards the advice and sleeps with two women that night. During intercourse, he begins to sprout tentacles. Both women undergo an accelerated pregnancy in which their stomachs split open like a flower and half-alien children emerge, killing them in the process. Patrick hides the rapidly growing alien children inside a remote shed and, the next day, tries to confide in his father, an ambitious U.S. Senator, who ignores his problems.
Under military supervision, scientists led by Dr. Laura Baker have created a more docile clone of Sil, named Eve, in an effort to understand the alien life form and prepare for defense should it ever arrive on earth. During Patrick's sexual encounter, the isolated Eve - undergoing tests in the lab - shows signs of great physiological excitement.
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Official Site: MGM Pictures
Links: Species 2 Wikipedia page Species 2 imdb page Species 2 official page