Scientist Dr. Henry Jekyll believes every human has two minds: one good and one evil. He develops a potion to separate them from each other. Soon, his evil mind takes over, and Dr. Jekyll becomes a hideous fiend known as Mr. Hyde.
Late one night, Sir Charles Baskerville is attacked outside his castle in Dartmoor, England. Could it be the Hound of the Baskervilles, a legendary creature that haunts the nearby moor? Sherlock Holmes, the world's greatest detective, is on the case.