A nurse returns to her home town to care for her dying father, and finds everyone she knows there has undergone a bizarre personality change.
Jackie Ivers is a Los Angeles nurse who returns home to the small town of San Vicente to find that her friends and family have taken on bizarrely different personalities. Jackie notices that everyone who goes into the town's lake come out different. As the movie progresses, Jackie first-handedly witnesses what is happening to everyone around her as she is kidnapped by aliens from a parallel world which is the duplicate to Earth but is now polluted and the ozone layer gone. In order to survive, the aliens intend to take over Earth the entrance to the duplicate Earth called the vortex, which are located in major bodies of water, ponds, and lakes.