About Vs. System: Batman VS. Joker, from BoardGameGeek:
The same core concept as the original Vs System still exists but with a new twist. You can now play as Batman or the Joker, but it doesnt stop there. You can enlist the help of other heroes such as Superman, or villains such as Catwoman.
Description provided by Roll for Sanity on YouTube:
In this episode we see what's inside the DC Vs. System starter of Batman vs. The Joker. This theme deck has everything two players need to get started in the DC Universe.