I think what made Spencer Tracy so good in this role was that his prior movies showed the actor as he seemed to be, a nice guy. As Dr. Jekyll, he is a caring and understanding doctor, but when turning into Hyde we see a performance unlike any Mr. Tracy has played before. Hyde is all evil, totally delighted by being menacing with no regard to anyone else. For this reason I would highly recommend this movie to anyone who enjoys a good thriller, without the gore. The rest of the cast is excellent, especially Ingrid Bergman as Ivy, who is the subject of Hyde's sick amusement. This is a chilling movie, made in black and white which seems to add to the suspense.
