This year, Supergirl will participate in the Arrowverse's take on Crisis on Infinite Earths alongside the rest of The CW heroes. However, showrunners Robert Rovner and Jessica Queller have revealed that the crossover will have a lasting impact on the series' status quo.
"We're teeing up 'Crisis' in our way, which is a little bit different from the way Arrow and The Flash are doing it," Rovner told IGN. "But it's all interconnected, and the Monitor will be a part of that storytelling." Rovner also stated that the return of Martian Manhunter's brother Malefic J'onzz (voiced by Phil LaMarr) at the end of Season 4 was a plot thread that leads into the crossover, referring to it as "a gauntlet for J'onn."
"In general, ["Crisis"] has more impact than our crossovers usually do," Queller added. "It filters into the rest of our season where normally the crossovers are standalone."
Rovner then ended the interview by saying, "The world will be shaken up and there will be fallout, post-Crisis."
As fans are aware, it was in the original Crisis limited series that the Pre-Crisis version of Supergirl died at the hands of the Anti-Monitor. While that's almost certainly not going to happen in this version, Rovner and Queller's words make it clear that changes are in store for the Girl of Steel once the event ends.
Returning Sunday, Oct. 6 at 9 p.m. ET/PT on The CW, Supergirl stars Melissa Benoist as Kara Danvers, David Harewood as Martian Manhunter, Mehcad Brooks as Jimmy Olsen and Chyler Leigh as Alex Danvers.