Here’s a look at Batman: Arkham Knight add-on content titled “A Matter of Family”. This add-on lets you take on the role as Batgirl who is trying to rescue her father Commissioner Gordon from The Joker and Harley Quinn. Tim Drake also joins the adventure and becomes playable. Check out the trailer and be on the look out as it hits PlayStationÂ®Network and Xbox LIVE on July 21st. Those who purchased the season pass will get to get their hands on it a week earlier on July 14th.