When does Supergirl return?

Supergirl is an American superhero drama television series that aired on CBS and later The CW from October 26, 2015, to November 9, 2021. Based on the DC Comics character created by Otto Binder and Al Plastino, the series follows Kara Zor-El (played by Melissa Benoist), Superman's cousin, and one of the last surviving Kryptonians from the planet Krypton. As Supergirl, Kara uses her powers to protect National City and later becomes a key member of the Arrowverse.