ABC and Marvel have debuted a promo for episode 19 of "Marvel's Agents of S.H.I.E.L.D." which you can check out in the player below. Titled "The Only Light in the Darkness," the episode is described as follows:
"With their world turned upside down, Coulson races to save the life of his one true love as the mystery of 'The Cellist,' which began in Marvel's The Avengers, is finally revealed."
Written by Monica Owusu-Breen and directed by Vincent Misiano, "The Only Light in the Darkness" is set to air on April 22. "Marvel's Agents of S.H.I.E.L.D." airs Tuesdays at 8 p.m. on ABC.