With this cast and Vincent Minelli directing you might reasonably expect a professional product but you are not going to get one. Hepburn is said to have accused Mitchum of getting the part solely because of his looks because he could not act. If so she was right but beware you who live in glass houses. Hepburn was equally awful and Robert Taylor was decidedly mediocre. Marjorie Main is the one highlight and she is gone after the first 15 minutes or so. The biggest problem however is the totally unbelievable plot. Edmund Gwenn is a scientist living with daughter/assistant (Hepburn) in a home, with adjoining laboratory, run by Marjorie Main. Robert Taylor plays an Elon Musk type, a 40 year old multi-millionaire bachelor, who is trying to win the rights to one of Gwenn's products. He comes to the Gwenn home and is immediately smitten with Hepburn and they marry shortly thereafter and then it gets bad, really bad. Horrible dialogue combined with a preposterous plot, miscast actors and obvious foreshadowing make for one long and tedious movie. There is a reason you have never heard of this one. It is awful.

I generally only write reviews when I can be positive — but really, when you've included such greats as Robert Taylor, Katharine Hepburn and Robert Mitchum, couldn't someone have found a better, less implausible script? Yes, Dana Andrews did fall in love with Laura before meeting her in that wonderful film named after that great character. But as Laura, Gene Tierney had enough personality and charisma to pull it off. While I normally admire Robert Mitchum's wonderful acting skills, in this movie, Mitchum's character had no pizazz whatsoever — nada, zilch, nothing. Okay, so maybe Robert Taylor's character was a murderous thief, but at least you could stay awake when he opened his mouth. And I've never seen Hepburn appear so lackluster. After her performances in African Queen and Philadelphia Story, what a disappointment. It's generally okay when movies stretch our credulity IF there are other aspects to compensate — for example, leg-slapping hilarity or intensely moving drama, but to me, Undercurrent just comes across as lame and foolish. My favorite part is that no less than three characters in the movie can play the same song on the piano. And Brahms Symphony No. 3 isn't exactly chopsticks. Don't waste your evening.

Pure melodrama (not noir) and not very good at that. Looks great, not satisfying cinematically. I'm shaking my head at all the people saying Mitchum was cast against type. This early in his career, he didn't really have a type.Totally not believable that Hepner's character goes from professional, competent and self-assured to the frightened, clingy female the plot requires of her.It drags, it's predictable, and it's bloated and boring. Bleah! With this cast, I was wondering why I'd never heard of it before. Now I know. Save yourself!

"Undercurrent" (1946 - Drama / thriller) starring Katharine Hepburn, Robert Taylor, and Robert Mitchum. Also the first screen appearance by Jayne Meadows (a far cry from her role in the Honeymooners - she was lovely, had a nice speaking voice - not whiny at all, and was a good actress!)Directed by Vincente Minnelli, doing a noir-ish turn, capably. In addition to the suspense, there are some charming "family" moments, particularly between Hepburn and her father in the early scenes.Minnelli stumbled by casting Margery Main in this, but to the great relief of all concerned (including, from the looks of things, the other actors in the film) her role is limited to 6 or 8 lines. Her character is the only one that rings utterly false and forced. An unsuccessful attempt at injecting levity/"cute" into an otherwise straightforward suspense film.Robert Mitchum appears to be 16 years old in this; baby-faced and sober (unlike his later performances).Hepburn is great - none of the twitchy-mannerisms that sometimes plagued her characterizations. Believable in a different role from her usual tough-gal type.Robert Taylor! Who knew he was a really good actor? I thought he just did westerns.Worth renting.