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 S03E02, Supergirl have to fight to a thief, who are with psychic power attacts to save National City. Maggie and Alex have happy time together.