In the past 2 weeks, a steady stream of promotion for the Flash/Supergirl episode has been coming our way in the form of an official poster and 2 teasers in preparation for the big day.
Now, take a look at the awesome new full-length trailer:
In the trailer we can see the two heroes feel comfortable with each other and have a brother-sister relationship.
It is also revealed Flash's arrival on Supergirl's world does not go unnoticed by Cat Grant.
The official synopsis for the episode reads:
“Kara gains a new ally when the lightning-fast superhero The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home.”
So the scarlet speedster and the girl of steel are actually working together because of a deal? Does that mean we will get the classic superhero duel before they realize they are actually on the same side?
As mentioned above, Flash and Supergirl will battle against returning villain Livewire and newcomer Silver Banshee.