Pop singer Melissa McCammon is about to commit suicide by overdosing on drugs. With her once meteoric career at a standstill and her husband (Xander Berkeley) cheating on her, she sees no hope. Then she encounters Rachael, an ardent fan from the future. Rachael is a time traveler — and an uninvited tourist in Melissa's body. She tells Melissa that her music inspired her future fans to resist a totalitarian takeover, which will succeed if she dies now. However special authorities are out to punish Rachel for her crime, as time-traveling and using a host body plus changing the past is a serious offense, and she must be subliminated. The authorities from the future want Melissa dead and will resort to anything — including murder — to preserve their version of the past.
The final scene shows Melissa on the stage (in her friend Janet's body) singing to an audience.