Hansel and Gretel: An Opera Fantasy is a stop motion animated theatrical feature film that was created in 1954 and released by RKO Radio Pictures. It is based on Engelbert Humperdinck's opera Hänsel und Gretel, and contains many musical numbers. It was the first American feature-length animated film not made by Disney since 1941's Mr. Bug Goes to Town and first feature length feature film not made with traditional animation.. Anna Russell provides the voice of the witch, noted dramatic actress Mildred Dunnock (Death of a Salesman) provides the voice of Hansel and Gretel's mother, and several noted opera singers of the time provide the voices of the other characters.