'The RKO Story' is almost as good as 'MGM: When The Lion Roars' and benefits from a large array of interviews with RKO stars and directors such as Katharine Hepburn, Lucille Ball, Ginger Rogers, Fred Astaire, Jane Russell, and Robert Mitchum.
Each episode of six touches on a different aspect of the studio (beginnings, women in leading roles, Fred and Ginger, Orson Welles, the McCarthy trials, and the decline of the studio with Howard Hughes at the helm), mixing comments, clips, and interviews.
Well worth watching if you're interested in the history of the big studios, and this story is well told. My only quibble would be that focusing one whole episode on Citizen Kane is a bit much when the rest of the studio's output is taken into consideration: but still, it is often slated as the greatest film ever made and this episode gives it honest discussion time.