In the first Kharis film, The Mummy's Hand (1940), the character was played by Western-film actor Tom Tyler, while the three subsequent films, The Mummy's Tomb (1942), The Mummy's Ghost (1944), and The Mummy's Curse (also 1944), starred Lon Chaney Jr. in the role.
This passage describes how the role of Kharis, a famous monster from horror movies, was portrayed by two different actors in the early Universal Horror series.