Frequency is a 2000 American science fiction thriller film. It was co-produced and directed by Gregory Hoblit and written and co-produced by Toby Emmerich. The film stars Dennis Quaid and Jim Caviezel as father and son, Frank and John Sullivan respectively. In New York City during October 1999, John Sullivan (Caviezel), a 36-year-old homicide detective, breaks up with his girlfriend Samantha (Melissa Errico) with the reason partially attributed to the trauma caused by the death of his fireman father Frank (Quaid). Still living in the same house where he grew up, he discovers his father's Heathkit single-sideband ham radio and begins transmitting radio signals. Because of highly localized electro-temporal spatial effects caused by unusual aurora borealis activity, John somehow makes contact with his father exactly 30 years in the past on the day before his death in a warehouse fire. The ensuing conversation results in Frank thinking John's a stalker. Before the connection cuts out, John is able to shout out the circumstances that led to Frank's death.