There are few actors more convincing in drama than Spencer Tracy. He made dozens of wonderful films from the 30s to the 70s in his illustrious career. This is one of them. He plays a newspaper reporter seeking out the humanitarian, Dr. Livingstone. The famous line "Dr. Livingstone, I presume", comes from this film. Tracy is admirably supported by the Best Supporting Actor in the history of Hollywood, Walter Brennan. A riveting film from beginning to end.