The Arrow-verse’s “Crisis on infinite Earths” event brought the various DC TV shows (and even the movies) together into one universe.
Focusing on Courtney Whitmore’s superhero journey, Stargirl will be a brand new show that is kinda sorta set in an existing universe.
Stargirl takes place on Earth-2 rather than the Earth-1 of the Arrow-verse shows, making it a show suitable for new or returning superhero fans.
Stargirl will be one of the more unique shows hitting the airwaves during the coronavirus pandemic, as episodes of the latest DC superhero series will actually release first on the DC Universe streaming service before premiering on The CW the next day.