Superman II is the 1980 superhero film credited to being directed by Richard Lester. It is a direct sequel to the 1978 film Superman and stars Gene Hackman, Christopher Reeve, Terence Stamp, Ned Beatty, Sarah Douglas, Margot Kidder, and Jack O'Halloran. The film is infamous for being the only Superman film to be filmed by two directors. For this reason, Superman II is surrounded with controversy since original director Richard Donner had completed, by his estimation, roughly 75% of the movie in 1977 before being taken off the project. Many of the scenes were shot by second director Richard Lester, who had been an uncredited producer on the first film. However, in order to receive full director's credit, Lester had to shoot up to 51% of the film which included refilming several sequences originally filmed by Donner. According to statements made by Donner, roughly 25% of the theatrical cut of Superman II contains footage he shot, including all of Gene Hackman's scenes. Superman II was released in Europe and Australia on December 4, 1980, and in other countries throughout 1981. Selected premiere engagements of Superman II were presented in Megasound, a high-impact surround sound system similar to Sensurround.