The vaudeville and Broadway "sister act" of Vivien and Rosetta Duncan, best known for their characterizations of Eva and Topsy in Uncle Tom's Cabin, star in the creaky backstage musical melodrama It's a Great Life. The ladies are cast as travelling entertainers Babe and Casey Hogan, who work their way up the ladder from the small time to the Palace. The act breaks up when swell-headed Jimmy Dean (Lawrence Gray) marries Babe, but Casey rushes back to her sister's side when the latter is stricken by a serious illness. As she coaxes Babe back to health, Casey describes the "big act" she plans to stage, whereupon the film segues into an elaborate Technicolor sequence which has about as much to do with the rest of the film as the invasion of the Huns. Children of the theatre, Vivien and Rosetta Duncan were unable to scale down their performances for the more intimate demands of the camera, which is why they lost the lead roles in Broadway Melody (1929) to Bessie Love and Anita Page. But having signed the Duncans to a one-picture contract, MGM had to put them in something -- hence the existence of It's a Great Life.