In Supergirl S03E01, like Superman in his name of ” Man of Steel”, Supergirl has the same title. Kara have more challenges to face in this episode, Maggie and Alex chase for a crime car, then they is shooted and Supergirl show up to save them.

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.

Supergirl S03E03, Alex and Supergirl hold a Alone party, then John come and say that he have to back to Mars, and Kara want to go with him.

In Supergirl S03E04, Kara investigate someone she think that he or she has mysterious connection to her.

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.

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 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