Harley Quinn's Revenge 'Payback Trailer'

This 2012 expansion for Batman: Arkham City requires the base game and delivers several hours of new story content where Batman is lured back by a vengeful Harley Quinn. The core gameplay retains the established hack and slash combat and adventure elements, but notably introduces the ability to play as both Batman and Robin across the new missions. Community reception focuses on this being a focused, narrative epilogue rather than a massive content addition.