'Legends of Tomorrow' season 2 spoilers, plot news: Another JSA member added, synopsis revealed

Another member of the Justice Society of America (JSA) has been added to "Legends of Tomorrow" season 2. Sarah Grey of the upcoming "Power Rangers" movie was tapped to play Stargirl.

Stargirl is a character created by DC Comics president Geoff Johns. Her real name is Courtney  Whitmore but changes her identity to Stargirl as she began wielding Starman's cosmic staff and the Cosmic Converter Belt.

Her history with the JSA in the comics suggests that Stargirl has worked with them not long after she took on the superhero role.

Grey's casting in "Legends of Tomorrow" season 2 comes just days after Matthew MacCaull was announced to play the role of Stargirl's fellow JSA member Commander Steel.

IGN points out that Stargirl's appearance in "Legends of Tomorrow" season 2 is not the first time the character was portrayed live action. Britt Irvin played the role in "Smallville."

Other JSA members include Hourman, who was already seen in the season 1 finale of the series played by Patrick J. Adams of "Suits" and the new Vixen named Amaya Jiwe played by Maisie Richardson-Sellers. Dr. Mid-Nite and Obsidian will also appear but are yet to be cast.

The Justice Society of America will play a vital role in "Legends of Tomorrow" season 2. They will help the Legends Rip Hunter (Arthur Darvill), White Canary (Caity Lotz), Atom (Brandon Routh), Heatwave (Dominic Purcell) and Firestorm (Victor Garber and Franz Drameh) protect time and history.

The JSA will be with the Waverider crew in battling the Legion of Doom, which is composed of Malcolm Merlyn (John Barrowman), Captain Cold (Wentworth Miller), Damien Darhk (Neal McDonough) and Reverse Flash (Matt Letscher ).

"Legends of Tomorrow" season 2 will premiere on Thursday, Oct. 12 at 8 p.m. EDT on The CW. The synopsis for the new season is as follows:

After the defeat of the immortal villain Vandal Savage and the corrupt Time Masters who colluded with him, a new threat emerges. Dr. Nate Heywood (Nick Zano), an unconventional and charming historian, is thrust into the action upon making a shocking discovery - the Legends are scattered throughout time.

Nate must find a way to rescue season one's beloved team of heroes and rogues, including billionaire inventor Ray Palmer, who has created an exo-suit with the power to shrink him to miniscule size, as the Atom; Sara Lance, the White Canary, a trained assassin; Professor Martin Stein and Jefferson "Jax" Jackson, who together form the meta-human Firestorm; and Mick Rory aka Heat Wave, a career criminal. When the Legends encounter the J.S.A (the Justice Society of America, the precursor to DC's Justice League) in the 1940s, Amaya Jiwe aka Vixen, joins the team. While the team reunites, a mystery looms - the fate of former captain Rip Hunter.

Once reunited, the Legends continue their new mission to protect the timeline from temporal aberrations - unusual changes to history that spawn potentially catastrophic consequences. When Nate, the grandson of J.S.A. member Commander Steel, unexpectedly finds himself with powers, he must overcome his own insecurities and find the hero within himself. Ultimately, the Legends will clash with foes both past and present, to save the world from a mysterious new threat.