Supergirl airs Mondays at 8pm on The CW, The Flash airs in the same timeslot on Tuesdays, Arrowon Wednesdays, and Legends of Tomorrow on Thursdays.
The latest addition to The CW primetime, Supergirl, revealed an Earth full of hidden aliens.
That may well tie in to the upcoming four-show crossover, where the Girl of Steel helps her alternate-Earth friends battle a horde of invading aliens named The Dominators.
Arrowverse executive producer Greg Berlanti has said that the showrunners’ aim is to create stories that are “fun and enjoyable,” but also with substance.