Supergirl 2×22 “Nevertheless, She Persisted” Poster, Promo, and Hi-Res Photos by Michelle · Published May 17, 2017 · Updated May 17, 2017 Season 2 Finale Poster SEASON FINALE – Supergirl challenges Rhea to a battle to the death – with the fate of Earth as the prize. But first she’ll have to defeat Superman. “Nevertheless, She Persisted” airs May 22, 2017 on The CW. Episode Stills