Supergirl | 8pm | The CW

Series Finale: In the penultimate buildup to the season finale, Supergirl (Melissa Benoist) and the super friends take drastic action after a loved one is kidnapped by Nyxly (Peta Sergeant) and Lex (guest star Jon Cryer). An unlikely ally steps in to help the team.

In the epic series finale, Supergirl is joined by familiar faces from the past to help her stop Lex and Nyxly for good. Meanwhile, Alex (Chyler Leigh) and Kelly (Azie Tesfai) prepare to walk down the aisle. Mehcad Brooks, Jeremy Jordan and Chris Wood return for the series finale.