Rollerball is a 1975 dystopian science fiction film directed by Norman Jewison from a screenplay by William Harrison, who adapted his own short story 'Roller Ball Murder', which first appeared in 1973 in Esquire magazine. Although it had an American cast, a Canadian director, and was released by the American company United Artists, it was produced in London and Munich. In the film, the world of 2018 is a global corporate state, containing entities such as the Energy Corporation, a global energy monopoly based in Houston which deals with nominally-peer corporations controlling access to all transport, luxury, housing, communication, and food on a global basis. The film's title is the name of a violent, globally popular sport around which the events of the film take place. It is similar to Roller Derby in that two teams clad in body armor skate on roller skates (some instead ride on motorcycles) around a banked, circular track. There, however, the similarity ends.