This movie was produced right after production of the original "The Flintstones" (1960) series ended, and was intended as a swan song for the characters. Henry Corden, who provided Fred Flintstone's (uncredited) singing voice, also voiced several incidental characters on "The Flintstones" (1960) and would later take over Fred's voice after 'Alan Reed' 's death in 1977. During the "Teammates" musical number, when Fred and Barney's airplane falls apart, it becomes th ...[Read Story ]