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Lock-Up, or Lyle Bolton, is an insane vigilante residing in Gotham City.
Lyle Bolton was a security guard at Arkham Asylum, and like other Arkham employees before him such as Dr. Harleen Quinzel, Dr. Jeremiah Arkham, and Professor Jonathan Crane, Bolton went insane, and would torture the villains (even going as far as to threaten Scarface with termites!). When he was persecuted and exposed by Harley Quinn, The Scarecrow, Ventriloquist and Scarface, he began not targeting only villains, but also law officers such as James Gordon, political figures like Mayor Hill, and anchors like Summer Gleeson. When Batman arrived to rescue them, Bolton, now using the name Lock-Up, attempted to make a deal with Batman, but he turned him down and rescued his captives.
Though he is technically an enemy of the Batman-family, Lock-Up's intentions are good and when it is absolutely necessary, Batman has allied himself with Lock-Up, such as when Gotham was hit with an earthquake he allowed Lock-Up to "run" Blackgate Penitentiary to keep its inmates from escaping.