Flashback ten years to meet the original Ghostbusters; Peter Venkman, Egon Spengler, Ray Stantz…and Michael Draverhaven, four graduate students studying the paranormal. But when they try to contact the spirit world, something goes horribly wrong, driving Michael insane. Back in the present, Egon discovers the secret behind the recent ghost attacks, while Ray confronts Draverhaven and learns that the terrifying events of that long ago night could destroy the world.