Journey Back To Oz is an official animated sequel to the 1939 MGM film The Wizard of Oz. It is loosely based on L. Frank Baum's second Oz novel, The Marvelous Land of Oz. Baum received no screen credit. The movie began production in 1964, but ran out of money and was halted for more than four years. It was only after the Filmation studio had made profits on their numerous television series that they were able to finish the project, copyrighted 1971, released in 1972 in the UK and in 1974 in the U.S.). It features the voice and singing debut of Liza Minnelli as Dorothy Gale (played in the previous 1939 film by her late mother, Judy Garland). Other voices were by Milton Berle, Mickey Rooney, Paul Lynde, Herschel Bernardi, Paul Ford, Danny Thomas, Margaret Hamilton (also from the 1939 film, but now playing Aunt Em rather than the Wicked Witch of the West), and opera singer Risë Stevens as Glinda. The songs are by Sammy Cahn and Jimmy Van Heusen.