Supergirl: O Brother, Where Art Thou?

"O Brother, Where Art Thou?" is the fifteenth episode of season four of the superhero fantasy series Supergirl and the eightieth episode of the series overall. It was directed by Tawnia McKiernan with a screenplay written by Derek Simon and Nicki Holcomb. It first aired on the CW Network on Sunday, March 17th, 2019 at 8:00 pm.