'Supergirl' Season 4, Episode 15 "O Brother, Where Art Thou?": Cryer's Lex Is the Serum the Series Needed [SPOILER REVIEW]
"O Brother, Where Art Thou?" the best episode of CW's 'Supergirl' ever? Maybe, with Lex Luthor's debut, J'onn's decision, Supergirl's potty mouth, and more!