Harley Quinn isn’t particularly happy about... Wait, that’s probably a spoiler isn’t it? If you’ve already played Batman: Arkham City, then we probably don’t need to tell you what Harley Quinn’s upset about.

What we do need to tell you is that she’ll get her revenge on 29th May, when Batman: Arkham City is updated with a new DLC pack. The two-hour campaign will see you switch between Batman and Robin as you attempt to foil the foxy jester’s plans.

If you haven’t played Batman: Arkham City yet, there’s good news afoot. Warner Bros has announced a Game of the Year edition will launch in North America on 29th May and Europe on, er, 7th September. No, that’s not a typo – it really is coming to Europe three months late.

The updated retail release will include the original game and all of its DLC, including the aforementioned Harley campaign. There’s no word on a price yet but expect it to be slightly cheaper than the original release.