Unknown Chaplin is a three-part 1983 British documentary series about the career and methods of the silent film luminary Charlie Chaplin, using previously unseen film for illustration. The series consist of three episodes, with title My Happiest Years, The Great Director and Hidden Treasures. The film was directed and written by film historians Kevin Brownlow and David Gill. They were granted access to unseen material from Chaplin's private film archive by his widow Oona O'Neil Chaplin. Episode one of the series was also based on a large cache of pirated outtakes from the Mutual Film Corporation period of Chaplin's career (1916-1917), made available by the film collector Raymond Rohauer. The documentary also includes interviews with Chaplin's second wife Lita Grey, his son Sydney Earl Chaplin, and his surviving co-stars Jackie Coogan, Dean Riesner, ()