Donkey Kong Jr. (ドンキーコングJR. Donkī Kongu Junia?) is a 1982 arcade-style platform video game by Nintendo. It first appeared in arcades, and, over the course of the 1980s, was later released for a variety of platforms, most notably the Nintendo Entertainment System. The game's title is written out as Donkey Kong Junior in the North American arcade version and various ports to non-Nintendo systems. Its eponymous star, Donkey Kong Jr., also called simply Junior[3] or abbreviated as DK Jr.,[4] is trying to rescue his father Donkey Kong, who has been imprisoned. Donkey Kong's cage is guarded by Mario, in his only appearance as an antagonist in a video game. This game is the sequel to the video game Donkey Kong, which featured Mario as the hero and Junior's father as the villain.