When "Sil" (Natasha Henstridge), a half-human, half-alien product of experiments with DNA codes obtained from beyond the stars, escapes from the top-secret Utah facility where she was created, Dr. Fitch (Ben Kingsley) calls in a quartet of specialists (Forest Whitaker, Michael Madsen, Marg Helgenberger, and Alfred Molina), to attempt Sil's capture.