Dr. Chaos, officially known as Dr. Chaos: Hell's Gate (ドクター・カオス 地獄の扉, Dokutā Kaosu: Jigoku no Tobira?) in Japan, is an action-adventure game originally released in Japan for the Family Computer Disk System in 1987 by Pony Inc. An English localization was produced for the Nintendo Entertainment System that was released in North America by FCI in 1988.