Tartarus, also called the Tartarus Organization and the Anti-Titans, is a fictional organization of supervillains in the DC Comics universe. They first appeared in Secret Origins of Super-Villains 80-Page Giant #1 (December 1999).
Tartarus was organized by Vandal Savage to be the anti-Teen Titans. He forces former Titan Omen to help him recruit members. She submits to Vandal but, unbeknownst to him, selects members that she knows will not function well as a team.
Tartarus' first mission is to find Adeline Kane, ex-wife of Deathstroke, who is serving as H.I.V.E. Mistress. Vandal Savage needs Adeline's blood to develop an immortality serum, and he slits her throat in order to get a sample. As it begins to heal, she begs Slade to kill her. When he is unable to do so because he is still in love with her, Starfire kills Adeline with a well-aimed starbolt. Red Panzer is also killed during the battle, and Savage deliberately shoots Cheshire as a distraction, and leaves her to be captured by the Titans.
Tempest learns that Omen is being held captive by Tartarus at their base in Scotland. He leads the Titans there to rescue her. As Lilith had originally planned, Tartarus collapses during the fight due to their inability to work together as a team. As the battle turns to the Titans's favor, Siren switches sides from Tartarus to aid Tempest. Tartarus disbands after their defeat.