Courtney Whitmore moves to Nebraska with her family and discovers her stepfather, Pat Dugan is hiding a major secret.

After Courtney has an unexpected run-in with a member of the Injustice Society of America, Pat reveals the truth to her about their history.

While Pat uncovers new information about the ISA’s plan, Courtney’s life gets turned upside down when someone from her past arrives in Blue Valley.

As the Injustice Society of America come closer to accomplishing their mission, Courtney and the JSA face off against Icicle and the villains of the ISA.

With summer break around the corner, Pat suggests the family take a vacation after seeing that Courtney has been spending too much time focused on being Stargirl and not enough time on her schoolwork. Meanwhile, as Beth attempts to reconnect with Chuck, she stumbles upon a major secret her parents have been keeping from her. Elsewhere, Yolanda continues to be haunted by Brainwave's death, and Rick secretly tracks Solomon Grundy after suspecting he may still be in the area.

As Eclipso unleashes the final part of his master plan, Courtney, Pat and the JSA band together to take him down once and for all.

With Starman back from the dead and her former super-villain enemies vowing to reform, Courtney is hopeful that there will finally be peace in Blue Valley. But when The Gambler arrives in town looking to make his own amends, the team finds themselves at odds over whether he can be trusted.

After a recent experience renews Courtney’s confidence, she sets out to make amends with those around her. Jakeem puts his foot down after Mike shares his latest plan. Finally, Beth makes a major discovery that leads to a terrifying battle no one saw coming.

Courtney and the JSA find themselves in the fight of their lives against their biggest threat yet.