PBS (Mon., Mar. 10, 9 p.m. ET)
Katharine Hepburn pays tender tribute to her longtime friend and co-star (in nine of his films). She talks about him and how they met. She and his daughter read Tracy’s diaries. Other stars remember him: Liz Taylor, Frank Sinatra, Burt Reynolds, Angela Lansbury. And you see scores of great movie clips, though you’ll have to look carefully to see what made Tracy a legend, for his specialty was making acting look easy. The show is utterly enchanting, but far from fawning. Hepburn likens her friend to “a baked potato…it’s pure, it’s of the earth and it’s dependable.” She reads a letter she wrote to Spence 18 years after his death, asking him how he could have been so unhappy. If you are not touched by that moment, then you should visit a doctor immediately to see whether you still have a heart.