Littleton and warns her that the police might uncover her role in the bombing. Tetch had given her one of his mind-controlling hats years before, which she used to try to take control of a guard and try to help Tetch escape from Arkham. The Hatter is caught as he tries to escape, and the mind-controlled guard fires on police before dying in return fire. Tetch himself is shot multiple times and left in critical condition. Distraught at the news, Elle Littleton inadvertently tells her daughter Connie that Tetch had killed the team for her, to "avenge her honor". Connie informs the police of everything that had happened, and Ella Littleton is arrested. While working with Black Mask, the Mad Hatter implants a mind control chip directly into Killer Croc's brain, which causes him to mutate again due to the virus he had been injected with by Hush and the Riddler. Killer Croc embarks on a quest to get payback on those responsible for his mutation, and starts with the Mad Hatter. Batman arrives in time to save him, but Killer Croc escapes. During Infinite Crisis, the Mad Hatter is first seen being roundly beaten by Argus, and then later fighting with the Secret Society of Super Villains during the Battle of Metropolis. "One Year Later"/Secret Six Tetch is revealed to have been involved in the plot by the Great White Shark to frame Harvey Dent for murdering various Gotham criminals in the Detective Comics storyline Face The Face. The capacity in which he is involved is left vague, however. Tetch's base of operations in Gotham City is destroyed following a search for an atomic weapon, by the former Robin, Tim Drake, and the current Captain Boomerang, Owen Mercer. A recording of Tetch appears on a monitor screen and tells them that the roof will be the final hat they will ever wear as it falls down on them. Robin and Boomerang narrowly escape the building. He is later approached by Cat-Man, and he joins the members of the Secret Six to oppose the Secret Society of Super Villains; they have recruited him in hopes of a defense against Doctor Psycho's mind control abilities. When Rag Doll attacks the Secret Six under Dr. Psycho's control, Tetch puts on what he calls his "thinking cap" and goes into a seizure. After the Six crash-land, they are attacked by the Doom Patrol,