When does Supergirl return?

Supergirl is an American superhero drama television series that aired on CBS from October 26, 2015 to April 8, 2016, and later The CW from October 10, 2016 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. The series was retroactively incorporated into the Arrowverse beginning with its second season, and became definitively linked with the franchise in the fifth season.