Gotham: 10 Villains That Should Appear In Season 4

9. Harley Quinn

Fox

Even though it's yet to be confirmed if Jerome is, in fact, the venerable Clown Prince of Crime (he very obviously is, let's be honest), it's clear that Gotham has found its Joker in that character. It is, however, yet to find its Harley, and while speculation has run rampant as to who the show's Harleen could actually be (some say it's Barbara, others Leslie), the true bearer of the mantle most likely belongs to the most unlikeliest of sources - a fleeting cameo in the season three finale.

Prior to the third season's conclusion David Mazouz had hinted that Harley would in fact be making an appearance in the finale, only for her inclusion to be, well, kind of obscure. Fans have speculated as to who Harley could've possibly been, but one of the more interesting theories revolves around a throwaway line given when Bullock arrested the Tetch-infested Gordon on the Gotham subway.

Inverse in particular made note of a specific New Yorker caught up in the bustle of Jim's arrest, and how they - much like the Quinn of the comics would - reacted with particular nonchalance towards the advancing officers, complete with the classic Quinn-twang.

Other theories have noted that the girl Bruce rescued at the end of the season could also be a Harley in waiting. Given just how far people are reaching for explanations however, it's more than likely that Harley - although not shown in the new trailer - could be making an appearance later than we all initially expected.

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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.