Watch The Supergirl Season 3 Finale Promo

Watch the Supergirl season 3 finale promo!

The CW has released the the promo for next week’s new episode of Supergirl, the season 3 finale! Check it out in the player below!

Set to air Monday, June 18, the Supergirl season 3 finale is titled “Battles Lost and Won” and is offcially described as follows: “SHOCKING SEASON FINALESupergirl (Melissa Benoist) and team take on Serena in an epic battle for Earth.”

Jesse Warn directed the episode which was written by Robert Rovner &

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