Frequency 1×09 “Gray Line” Season 1 Episode 9 Extended Promo (Winter Finale) – WINTER FINALE – Raimy (Peyton List) and Frank (Riley Smith) make a startling discovery about the Nightingale killer. Meanwhile, Frank is blindsided by a shocking betrayal. Mekhi Phifer, Devin Kelley, Anthony Ruivivar, Daniel Bonjour and Lenny Jacobson also star. John Showalter directed the episode written by Nancy Won (#109). Original air date 12/7/2016.