 Sil 's violent outbursts during sleep make the scientists consider her a threat . They try to kill her using cyanide gas but she breaks out of her containment cell and escapes . The government assembles a team composed of anthropologist Dr. Stephen Arden ( Alfred Molina ) , molecular biologist Dr. Laura Baker ( Marg Helgenberger ) , " empath " Dan Smithson ( Forest Whitaker ) and mercenary Preston " Press " Lennox ( Michael Madsen ) to track and destroy Sil . Sil matures rapidly into an adult ( Natasha Henstridge ) in her early twenties and makes her way to Los Angeles . Her body strength , regenerative ability and intelligence make tracking her extremely difficult . The scientists fear she may mate with human males and produce offspring that could eliminate the human race . Sil is intent on producing offspring as soon as possible , and kills several people to prevent them from notifying the authorities or simply to use their clothing . 
 Sil <a href='null_genetive' title='1'><mark>'s</mark></a>violent outbursts during sleep make the scientists consider her a threat . They try to kill her using cyanide gas but she <a href='uninflect' title='2'><mark>breaks</mark></a> out of her containment cell and escapes . The government <a href='uninflect' title='3'><mark>assembles</mark></a> a team composed of anthropologist Dr. Stephen Arden ( Alfred Molina ) , molecular biologist Dr. Laura Baker ( Marg Helgenberger ) , " empath " Dan Smithson ( Forest Whitaker ) and mercenary Preston " Press " Lennox ( Michael Madsen ) to track and destroy Sil . Sil <a href='uninflect' title='4'><mark>matures</mark></a> rapidly into an adult ( Natasha Henstridge ) in her early twenties and <a href='uninflect' title='5'><mark>makes</mark></a> her way to Los Angeles . Her body strength , regenerative ability and intelligence make tracking her extremely difficult . The scientists fear she may mate with human males and produce offspring <a href='null_relcl' title='6'><mark>that</mark></a>could eliminate the human race . Sil <a href='drop_aux' title='7'><mark>is</mark></a>intent on producing offspring as soon as possible , and <a href='uninflect' title='8'><mark>kills</mark></a> several people to prevent them from notifying the authorities or simply to use their clothing . 
Sil  violent outbursts during sleep make the scientists consider her a threat . They try to kill her usin cyanide gas but she break out of her containment cell and escapes . The government assemble a team composed of anthropologist Dr. Stephen Arden ( Alfred Molina ) , molecular biologist Dr. Laura Baker ( Marg Helgenberger ) , " empath " Dan Smithson ( Forest Whitaker ) and mercenary Preston " Press " Lennox ( Michael Madsen ) to track and destroy Sil . Sil mature rapidly into an adult ( ashanti Henstridge ) in her early twenties and make her way to Los Angeles . Her body strength , regenerative ability and intelligence make tracking her extremely difficult . The scientists fear she may mate wit human males and produce offspring could eliminate the human race . Sil intent on producing offspring as soon as possible , and kill several folks to prevent them from notifying the authorities or simply to use their clothing .