Outside a movie premiere, enthusiastic fan Peppy Miller literally bumps into the swashbuckling hero of the silent film, George Valentin. The star reacts graciously and Peppy plants a kiss on his cheek as they are surrounded by photographers. The headlines demand: "Who's That Girl?" and Peppy is inspired to audition for a dancing bit-part at the studio. However as Peppy slowly rises through the industry, the introduction of talking-pictures turns Valentin's world upside-down.

A young Hollywood executive becomes the assistant to a big time movie producer who is the worst boss imaginable: abusive, abrasive and cruel. But soon things turn around when the young executive kidnaps his boss and visits all the cruelties back on him.