DOCUMENTARY PREMIERE: Alex Winter, a former child actor himself, directs this documentary, which interviews former child actors about their experiences, good and bad, as actors on stage, screen and TV. The opening credits, which intersperse images of the stars on the sidewalk of Hollywood Boulevard with images of those same childhood stars (Mickey Rooney! Judy Garland! Shirley Temple!), are enough to hook you. And the rest, while never becoming sordid or taking advantage of its interview subject