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.

After realizing that she needs the extra help, Courtney sets out to recruit new members to the Justice Society of America – starting with Yolanda Montez.

As Pat teaches Courtney, Yolanda, Beth and Rick the importance of teamwork, the ISA converge to figure out who is trying to take them down.

With the ISA on their trail, Courtney, Pat and the team regroup to figure out their next steps. Meanwhile, Rick makes a breakthrough, and the team prepares for a showdown with the ISA.

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.

Still on the lookout for evil in Blue Valley, Courtney grows suspicious after an unexpected visitor shows up at the Dugan house. Meanwhile, Barbara and Pat become concerned after a visit from a mysterious antiques collector named Richard Swift. Elsewhere, Cindy puts her plan in motion.

After getting a taste of the superhero life, Mike pleads with Pat to let him join the team. Elsewhere, after seeking help from Thunderbolt, the JSA prepare for a confrontation with The Shade.

As Pat considers whether he should come clean to Courtney about Eclipso's past, a surprise visit from Crock and Paula catches him and Barbara off guard. A tense run-in with The Shade provides Courtney with some valuable information. Finally, Cindy makes her move.

As Pat and Courtney clash over their next steps in their search for Eclipso, ominous weather conditions in Blue Valley hint that he may be near. Meanwhile, Cindy's plan to recruit another student takes an unexpected turn, and Cameron opens up to Courtney.

Cindy and her new team make their move against the JSA leading to an epic showdown.

After a frightening encounter leaves Courtney's life hanging in the balance, the team band together to determine their next steps.