The Arkham Knight is an identity used by two fictional supervillains appearing in DC Comics media. The original was created by Rocksteady Studios and DC writer Geoff Johns to serve as the titular villain in the 2015 video game Batman: Arkham Knight. He made his first appearance in the prequel comic book Batman: Arkham Knight #1 (February 2015) and received his own 6-issue miniseries Batman: Arkham Knight GENESIS, with #1 released on August 26, 2015. He is voiced by Troy Baker. Depicted as the mysterious commander of a vast militia of mercenaries, the Arkham Knight harbors a deep-rooted grudge against Batman and fully intends to kill the vigilante after making him suffer. To this end, he allies himself with the Scarecrow and provides a military presence in the evacuated Gotham City during the events of Batman: Arkham Knight. Towards the end of the game's main story, his true identity is revealed to be Jason Todd, adapted from a pre-existing character in the comics who acted as the former and second Robin. In the game's universe, Todd was thought to have been killed years earlier by Batman's nemesis the Joker.
The Arkham Knight persona later crossed over into the comics in Detective Comics #1000, created by Peter Tomasi and Doug Mahnke. In the DC Comics Universe, the Arkham Knight is depicted as a wholly original character named Astrid Arkham, with no direct relation to Jason Todd. Raised within the Arkham insane asylum by the inmates, she grew up viewing many of Gotham City's criminals as innocent victims of Batman, who she blamed for her mother's death. She becomes the Arkham Knight to end his vigilante career by force.