The CW has released an extended trailer for the return of Supergirl. In an episode called Supergirl Lives directed by Kevin Smith, we see the return of season 1 villain Livewire and Mon-El chooses to be a hero like Kara. James Olsen is becoming more accustomed to being Guardian and we get a look at a pair of aliens and one of them is a Dominator.
Supergirl returns January 23rd.
https://youtu.be/7FBVj9CQFMA