The movie covers the events which occurred in between the downfall of The Company and the finale of the series. It details the arrest and incarceration of Sara Tancredi, the final escape plan which Michael devises for Sara. It also reveals the ultimate fate of Gretchen Morgan.
After she delivers her child in an ambulance, alien Eve is killed by a half-breed. Fortunately, Dr. Abbot scoops up the baby alien and escapes. In time, the baby grows into a gorgeous blonde named Sara and begins her quest to find a worthy mate. But Sara is also savage and leaves a trail of deaths in her wake. This carnage makes chemistry student Dean question whether to help her race or not.