New Supergirl Season 2 trailer arrives Following the first trailer and the first clip, The CW has released a new Supergirl Season 2 trailer that you can watch in the player below! Titled “The Adventures of Supergirl,” the Season 2 premiere of the series is described as follows: “When a new threat emerges in National City, Kara/Supergirl teams up with her cousin, Clark Kent/Superman (guest star Tyler Hoechlin), to stop it.