"The Adventure of the Oft-Adapted Detective": Adaptations of Sherlock Holmes by LeiA

In the 1945 film, "Pursuit to Algiers", one of many films starring Basil Rathbone and Nigel Bruce as the original dynamic duo, Dr. Watson regales the passengers of a cruise ship with a tale about what creature tantalizingly mentioned in "Adventure of the Sussex Vampire"?

Name this comedy film in which it turns out that Sherlock Holmes (Michael Caine) is a fictional character created by Dr. John Watson (Ben Kingsley) who uses the character to enable him to solve crimes incognito so as to avoid damaging his medical career.

Who directed and co-wrote "The Private Life of Sherlock Holmes", a film said to be one of the inspirations for the current BBC Sherlock?

On the Mercury Theater on the Air radio adaptation of William Gillette's play, "Sherlock Holmes", what actor, of course, played Sherlock Holmes?

There's only one actor who has played both Sherlock Holmes and his older Brother Mycroft, albeit in different films. He's also one of the few actors who has played both Dracula and Sherlock Holmes on film.

Although renowned for playing Sherlock Holmes in the acclaimed Granada television series, Jeremy Brett played Freddy Eynsford-Hill in the big screen adaptation of what Lerner and Loewe musical?

Who recently appeared as Sherlock Holmes in the film, "Mr. Holmes", based on "A Slight Trick of the Mind" by Mitch Cullin?

In the 2007 video game "Sherlock Holmes: The Awakened", Sherlock Holmes tangles with crazed cultists who worship what terrifying cosmic entity?

What director-screenwriter adapted his own novel, "The Seven-Percent Solution", for the big screen? He also directed and wrote the screenplays for an adaptation of Jack Finney's "Time After Time" and two of the Star Trek movies featuring the original crew, including everyone's favorite, "The Wrath of Khan."

What actor-writer-comedian-novelist appears on the BBC's "Sherlock" as Mycroft Holmes, but also co-created the series with Steven Moffat?

In Langdon McCormick's 1905 play, "The Burglar and the Lady", Holmes is pitted against what fictional criminal created by E. W. Hornung (Doyle's brother-in-law)? NOTE: McCormick did not have the rights to either Holmes or this character.

A board game based on the Hugo Award-winning Sherlock Holmes pastiche, "A Study in Emerald", was released in 2013. Who wrote the short story which features an alternate universe where the world is ruled by Lovecraft's "Great Old Ones"?