Franklin Simpson (Earth-78)

"Throughout this ordeal, if we've learned anything, it's that human life is sacred. And we've learned that, every day, life should be cherished. Justice is the backbone to every peaceful society. And I believe that true justice has been served."

- - Detective Frank Simpson upon his promotion

Detective Lieutenant Franklin "Frank" Simpson was a police detective at the City of London Police who secretly acted as the Joker's loyal apprentice and muscle, capturing people the Clown believed did not appreciate their lives so he could test them on his games. Having a strong rivalry with Hayley Quinzel, Simpson blackmailed her into killing Doctor Claire Howlett so he could be chosen as Joker's successor. After Joker died at the hands of James Howlett Frank continued to act as the new Joker, being pursued by Detective James Gordon in the process. When he was nearly killed by Jeannie Napier, Frank pursued and killed her in vengeance, only to be left to die by Doctor Stephen Thompkins in the Bathroom.