The Danger Room is a fictional training facility appearing in American comic books published by Marvel Comics. It first appeared in The X-Men #1 (September 1963) and was created by Stan Lee and Jack Kirby. The facility is depicted as built for the X-Men as part of the various incarnations of the X-Mansion. Its primary purpose is to train the X-Men, initially using traps, projectile firing devices, flamethrowers, and mechanical dangers such as presses and collapsing walls. These were replaced by holographics, when the Danger Room was rebuilt using Shi'ar technology. It gained sentience in Astonishing X-Men as Danger. Publication history An obstacle course in which the X-Men train appears in The X-Men #1 (September 1963), but the Danger Room is never mentioned by name. The name "Danger Room" is first used in The X-Men #2 (November 1963). According to X-Men writer/editor/co-creator Stan Lee, "the Danger Room was Jack Kirby's idea. I thought it was great because we could always open with an action sequence if we needed to." Early designs In the early books it was filled with traps, projectile firing devices, flamethrowers, and mechanical dangers such as presses, collapsing walls and the like intended to challenge the trainee. Meanwhile, an observer is in the overhanging control booth managing the room's mechanisms to oversee the exercise while manually ensuring the subject's safety. Later the Danger Room was upgraded with machines and robots for the X-Men to fight against. After befriending the Shi'ar the X-Men rebuilt the Danger Room with Shi'ar hard-light holographic technology. These upgrades were largely added by Beast. The Danger Room is located in the X-Mansion; every destruction of the latter led to a rebuilding, and usually upgrading, of the Danger Room. The training facility has endured extensive damage over the years, usually from X-Men training or X-Men going rogue, as Colossus did during The Muir Island Saga. Supervillains have dealt critical damage to it as well as taking over the facility, especially Arcade. The security and safety protocols that ensure the safety of anyone using the Danger Room have frequently been disrupted, tampered with by villains, failed, or have been completely negated in all the years of its use, each time happening more frequently as the room began to get more and more upgraded. It is suggested in the X-Men Official Guide that the objects in the Danger Room are holograms surrounded by force fields, supposedly