The CW Television Network has released the official synopsis for the upcoming season finale of Supergirl an episode titled “Battles Lost and Won” and you can check it out below.
“Battles Lost and Won” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)
SHOCKING SEASON FINALE – Supergirl (Melissa Benoist) and team take on Serena in an epic battle for Earth. Jesse Warn directed the episode written by Robert Rovner & Jessica Queller (#323). Original airdate 6/18/2018.
Supergirl airs on Mondays, on The CW.