Although “Supergirl” has already joined “Arrow,” “The Flash” and “Legends of Tomorrow” on The CW, the former CBS series remains isolated from the three shows in a sense that it isn’t technically a part of the Arrowverse. As revealed in Season 2 of “The Flash,” all of CW’s DC TV shows, except for “Supergirl,” are set on Earth-1, while the Melissa Benoist-led series is set in a completely different Earth.
