Frequency 1×12 “Harmonic” Season 1 Episode 12 Extended Promo – Raimy (Peyton List) and Frank (Riley Smith) make a huge discovery while continuing their search for the Nightingale. Meanwhile, Stan (Anthony Ruivivar) is willing to do anything to bring Frank down. Mekhi Phifer, Devin Kelley, Daniel Bonjour and Lenny Jacobson also star. Stefan Pleszcynski directed the episode written by Jeannine Renshaw (#112). Original airdate 1/18/2017.