Shapely small town "soda jerk" Lana Turner (as Peggy Evans) can serve jumbo banana splits blindfolded, but gets in trouble for doing it with general manager Robert Young (as Robert "Bob" Stuart). When he sees Ms. Turner without the blindfold, Mr. Young falls in love. And, she is a very beautiful young woman. Still hurting from the reprimand, Turner considers her boring life, and decides to give herself a complete makeover. When her farewell is mistaken for a suicide note, Young is blamed for Turner's disappearance.
Turner takes off for New York City, where she dyes her dark hair platinum blonde. There, a mishap lands her in the care of Eugene Palette (as Durstin), who suggests she may be a missing heiress. Turner decides to adopt one's identity ("Carol Burden"), then moves in on wealthy Walter Brennan (as Cornelius) and grandmotherly May Witty (as Baba). Although initially suspicious, Mr. Brennan accepts Turner as his daughter, after she identifies a childhood toy. But, Young needs to find Turner in order to clear his name, and make it a happily ever after ending for everyone.
Veteran Wesley Ruggles contributes some fine comic direction, especially for Young. According to "Turner Classic Movies" (TCM) host Robert Osborne, Mr. Ruggles' old friend Buster Keaton directed Lana's nicely played "blindfold" sequence, early in the running time. It also looks, to this viewer, like the "concert balcony" and "coming out party" could be Ruggles / Keaton collaborations. Despite their efforts, the movie seems too long, and doesn't make too much story sense.
Several actresses have tried, but it looks like Lana was one of the few who could have played the lead in a biography of Marilyn Monroe, who probably saw the 1940s Turner in the flickering darkness. MGM made "Slightly Dangerous" a well-produced "Cinderella" story for their new starlet; probably, they expected more mileage out of the picture, but Turner would prove a big pay off in due time. The "lingerie scene" shows off an obvious pair of assets. You also get to see rascally Robert Blake (as Sonny) hit Young on the foot with a hammer, and Florence Bates is always fun at the party.
****** Slightly Dangerous (4/1/43) Wesley Ruggles ~ Lana Turner, Robert Young, Walter Brennan, May Witty