Batman: Arkham City - 10 Coolest Easter Eggs, Secrets And References Explained

4. The Wider DC Universe

Batman Arkham City CADMUS
Warner Bros. Interactive Entertainment

If fans had gotten excited about references to the Injustice Gang in Arkham Asylum, then they went absolutely crazy for the references to the wider DC Universe in Arkham City.

Hidden within the world of Arkham City are dozens of references to the wider DCU outside of Gotham. The Black Canary Club - a reference to singer-turned-vigilante Black Canary - can be found to the east of the central church, which by proxy confirmed that Green Arrow existed too; Hugo Strange also makes explicit reference to the cities of Keystone and Metropolis. The former is synonymous with the Flash, while the latter is of course home to Superman. Dialogue between various henchmen also confirms the presence of Blüdhaven, home to Nightwing, who later appeared in Arkham City's DLC and as a supporting character in Batman: Arkham Knight.

Following that, in the Harley Quinn's Revenge DLC, signs for Cadmus can be found all over the Steel Mill. Fans of the early noughties Justice League cartoon may recognise the organisation as an opposing force to the Justice League, but they tend to have a greater emphasis on cloning in the comics.

Although Rocksteady are yet to deliver on their multitude of references to the wider DCU, the studio is heavily rumoured to be working on a Justice League game for next-gen systems. Here's hoping that's the case, because if they've managed to work wonders with Batman, just THINK what they could do with DC's entire roster.

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WhatCulture's very own resident movie guy, Ewan has been working in the content creation biz for over 10 years now, having started as a freelance contributor to WhatCulture Gaming all the way back in 2015. After graduating with a First-Class Honours in History from Northumbria University in 2017 (where he won a prize for a totally killer dissertation on the Watergate years), Ewan took on the role of Comics Editor at WhatCulture and quickly developed WhatCulture Comics into one of the biggest superhero-focused channels on YouTube. He followed this with a brief hiatus at Screen Rant in 2021, where he worked across the Gaming and Film sections as a writer and editor, before returning to WhatCulture as a Senior Content Producer / Presenter in 2023. He started his own podcast, We Love Dad Movies, in 2022, and has contributed several written pieces to the Eisner-nominated comics website Shelfdust as well. In his current role, Ewan incorporates his love of cinema, comic books, and history into written pieces and video essays for WhatCulture's Film & TV channel, as well as WhatCulture Gaming and WhatCulture Horror, with a particular focus on nineties-era Dad Movies, old school Westerns, and Golden Age Hollywood Noir. John Carpenter is his fave, and he thinks Batman Beyond should never have been cancelled. If that's your vibe, you'll probably like his stuff.