• Brec Bassinger as Courtney Whitmore / Stargirl:
A high school sophomore who discovers a powerful cosmic staff and becomes the hero Stargirl. She is the leader of the new Justice Society of America. Bassinger did not look at the previous portrayals of the character by Britt Irvin on Smallville or Sarah Grey on Legends of Tomorrow because they were depicted as "older, more mature version[s]" of Stargirl. Bassinger added the series followed the comic Stars and S.T.R.I.P.E. more "in that she's young, high school, naive, which I wanted to bring that into this version of Stargirl."
• Yvette Monreal as Yolanda Montez / Wildcat:
One of Courtney's friends who becomes a member of the new Justice Society of America.
• Anjelika Washington as Beth Chapel / Doctor Mid-Nite:
One of Courtney's friends who becomes a member of the new Justice Society of America.
• Cameron Gellman as Rick Tyler / Hourman:
One of Courtney's friends who becomes a member of the new Justice Society of America.
• Trae Romano as Mike Dugan:
Pat Dugan's son and Courtney's stepbrother.
• Jake Austin Walker as Henry King Jr.:
The son of Brainwave and a student at Blue Valley High.
• Hunter Sansone as Cameron.
A student at Blue Valley High.
• Meg DeLacy as Cindy Burman.
The daughter of Dragon King and the most popular student at Blue Valley High who is determined to follow in her father's footsteps.
• Neil Jackson as Jordan Mahkent / Icicle.
A member of the Injustice Society.
• Christopher James Baker as Henry King Sr. / Brainwave.
A member of the Injustice Society.

Pat tells Courtney that JSA member Hourman survived the attack and had been secretly searching for the Injustice Society across the country. In an effort to help, Pat created the armor. When Rex reached Blue Valley, he and his wife were killed in a car crash. Pat came to Blue Valley two years ago to pick up the trail, only to find Barbara. Pat advises Courtney against seeking out Brainwave and using the Staff, but she ignores him and creates a costume for herself from Starman's old uniform. Meanwhile, Brainwave finds Courtney's damaged school ID card at the site of their battle. While attending the high school's open house, Henry Sr. confronts Courtney and threatens to kill Barbara unless she brings him the Staff. Pat goes to confront Brainwave, but is easily defeated. Now calling herself Stargirl, Courtney fights Brainwave and short-circuits his powers, leaving him in a coma. Courtney asks Pat to work with her and become her sidekick, changing his codename from Stripesy to S.T.R.I.P.E. Meanwhile, Jordan Mahkent meets with associate Steven Sharpe at the Injustice Society's headquarters under The American Dream's office and learns about Starman's successor. SourceWikipedia

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