The Supergirl Exodus trailer The CW has released the trailer for the next episode of Supergirl, titled “Exodus.” You can watch the trailer below! “Exodus” airs on Monday, March 6, with the following official description: “As Alex (Chyler Leigh) searches for Jeremiah (guest star Dean Cain) and Kara (Melissa Benoist) investigates a series of alien kidnappings, the sisters realize they must break the rules to foil a new Cadmus plot.