Harley Quinn: Revenge at Union Square (movie): Harley Quinn. Union Square. Dynamite. What could go wrong? Loni Stark dons her supervillain alter ego, and heads to San Francisco for an explosive encounter. Some times to stay sane you have to go a little crazy... Discover the latest Discussions, Reviews, Quotes, Theories, Explanations and Analysis of Harley Quinn: Revenge at Union Square below