Producer-director David Butler once listed Glory as among his favorite films. Margaret O'Brien plays her first grown-up role as the owner of the eponymous racing filly. Despite the fact that the horse seems to be a dud, Margaret insists upon entering Glory in race after race. This proves financially draining to Margaret and her grandmother Charlotte Greenwood, but Walter Brennan, trainer for handsome horse breeder John Lupton, helps to raise the necessary funds to enter Glory in--what else?--the Kentucky Derby. The inevitable romance between Margaret and Lupton is less interesting than the combative (but basically affectionate) relationship between ageing ex-sweethearts Greenwood and Brennan. With the uncredited aid of Lawrence Welk Show costar Norma Zimmer, Margaret O'Brien warbles three songs.
~ Hal Erickson, All Movie Guide