There's a Boris Karloff marathon on Turner Classic Movies today. You can read about the entire line-up on their site, but here are some highlights.
At 5:30am, "The Ghoul," which reunites Karloff with his "The Old Dark House" and "Bride of Frankenstein" costar, Ernest Thesiger.
Many of his movies had very similar plots, with Karloff playing some kind of mad scientist who is executed and comes back to life, or is condemned to death, as in "Before I Hang," which is on at noon.
"Isle of the Dead" is one of three movies Karloff made with producer Val Lewton. In this one, Karloff fights the Balkan War and the plague. It's on at 3:45pm.