Classic 12 Episode Serial in which Captain Marvel originates. Shazaam!!!

To protect a magic talisman from being used for evil, a boy is given the power to become an adult superhero with a single magic word.

On his uncle’s death Sir Henry Baskerville returns from abroad and opens up the ancestral hall on the desolate moors of Devonshire. Holmes uncovers a plot to have Sir Henry murdered by a terrible trained hound. First casting of Rathbone and Bruce as Holmes and Watson.