Frequency is an American mystery science fiction drama television series that aired on The CW from October 5, 2016 to January 25, 2017. Inspired by the 2000 Gregory Hoblit film of the same name, Frequency was developed by Jeremy Carver. The series was canceled on May 8, 2017; five days later, an epilogue to the series was released.
In 2016, NYPD Detective Raimy Sullivan discovers that she is able to speak to her deceased father Frank Sullivan in 1996 via his old ham radio. Her attempts to save his life trigger the "butterfly effect", changing the present in unforeseen ways. To fix the damage, she must work with her father across time to solve a decades-old murder case.