|Real Name||Lyle Bolton|
|Occupation||Security guard at Arkham Asylum|
|Powers and abilities||None|
Lyle Bolton was the head of security at Wayne Enterprises before being hired as the head of security at Arkham Asylum apparently on the recommendation of Bruce Wayne. Bolton was present when D.A.V.E. escaped the asylum. Lyle Bolton went to investigate D.A.V.E.'s computer hardware. However, there was nothing he could do.
Bolton would eventually develop a deep hatred for the inmates of Arkham Asylum. In secret he would even tourture the inmates. After Batman captured the Scarecrow he returned him to Arkham. However, it appeared to Batman that Scarecrow only escaped Arkham to get away from Bolton. Later, Bruce Wayne called a meeting with Arkham's board of directors. During the meeting they interviewed various criminals and asked them about Bolton. However, Bolton had threatened them to remain quite. The criminals then realized that this would be their only chance to get rid of Bolton and they tell the Arkham board that Bolton tourtures them. Bolton is then fired from his job at Arkham. Months later Bolton returned as Lock-Up and began abducting criminals and tourturing them believing that Batman and the police could not keep them in Arkham. This brought Lock-Up into conflict with Batman who defeated him. Bolton then became in inmate at Arkham Asylum.