|Portrayed by:||Bruce Weitz|
- "They'll never slip past me again!"
Lyle Bolton was Arkham Asylum's former head of security who pushed the boundaries of the law and used unnecessary means to keep his prisoners in line. After being fired, he turned into the villain known as Lock-Up.
When Arkham Asylum was in dire need of a new Head of Security, Bruce Wayne felt Lyle Bolton, a security expert at Wayne Enterprises, was the perfect man for the job. What Bruce and the doctors at Arkham did not know was that Bolton pushed the boundaries of the law and used unnecessary means to keep his prisoners in line. So malicious that The Scarecrow, the "Professor of Fear" himself, escaped Arkham just to get away from the vicious security guard.
After an inquiry is ordered to address Bolton's behavior, his true colors are shown. He breaks out in a violent rage and is abruptly fired. Bolton blames the bureaucrats, doctors, and media for protecting the villains of Gotham City from true justice and vows to instill his own law and order upon them. He became Lock Up, and used his vast knowledge of security, crime, and punishment to instill his "justice" upon those who do him wrong.
Bolton then created a costume and tools, started calling himself Lock-Up and began to arrest the people he deemed to be at the root of Gotham's problems. He imprisoned Mayor Hill, Commissioner Gordon, reporter Summer Gleeson, and Dr. Bartholomew, and held them hostage aboard USS Halsey, a decommissioned battleship. The hostages were freed by Robin while Batman defeated Lock-Up. Lock-Up was placed in a cell in Arkham, where he was mocked by the same inmates he once tormented. Bolton wasn't too bothered by this though, because now he could keep an even closer eye on "his" prisoners