Samantha gets ready to go on a trip, leaving Alex to babysit Ruby. The DEO learns that a priestess with knowledge of Reign’s true mission is imprisoned in Fort Rozz

Two days after Kara’s defeat by Reign, the DEO and the Legion use the latter’s technology to heal Kara from her injuries. This saves her life but she remains in a coma.

Samantha wakes up at home with no memory of being in a Kryptonian fortress, but finds she is oddly tired. A mysterious Kryptonian symbol, unknown to Kara, appears throughout National City,

A Nazi regime rules the planet where an archer, Dark Arrow, is the Führer, and personally hunts the resistance forces. Dark Arrow seizes a temporal gateway from the Freedom Fighters members.

Supergirl S03E07, Kara, J’onn and Winn investigate a crashed spaceship detected beneath National City. They find Mon-El and occupied stasis tanks aboard. They take him back to the DEO

In Supergirl S03E06: Midvale, Back to Midvale High School, Alex & Kara have a mutual friend, she is murdered by her teacher, after effort on killing them failed, the teacher was arrested. But they also found out that someone who is drug dealer in accusing for killing their’s friend.

Supergirl S03E05, Kara and Sam investigate, discovering that all the affected children attended a public pool laced with a chemical which causes the same symptoms, and the manufacturer is owned by Morgan.