The BBC’s Sherlock left the audience with some big questions that might never be answered as there are no plans for more seasons or expansions to other media, but these questions have made way for a variety of theories, including one that suggests Sherlock Holmes used to be a secret agent for his brother, Mycroft Holmes. Created by Sir Arthur Conan Doyle, Sherlock Holmes is one of the most popular and beloved literary characters, and his popularity over the years has been such that he has been adapted to all types of media for decades, and one of the most recent and successful adaptations is the BBC’s series Sherlock.
Created by Mark Gatiss and Steven Moffat, Sherlock brought the title character and company to modern-day London, mixing some of his most notable cases from Arthur Conan Doyle’s books with more up-to-date stories and settings. Sherlock was led by Benedict Cumberbatch as the Great Detective and Martin Freeman as his friend and partner Dr. John Watson, and through them, the audience met other important characters from the books, such as Irene Adler (Lara Pulver), Jim Moriarty (Andrew Scott), and Mycroft Holmes (Gatiss), Sherlock’s brother. Sherlock also made some big changes to the characters, mostly to Sherlock Holmes himself, and one of those was his relationship with Mycroft.
Related: Why Sherlock Wrongly Ignored One Of The Book's Best Villains
In Sherlock, Mycroft and Sherlock didn’t have the best relationship and weren’t really fond of each other, yet due to their jobs, they often crossed paths and they even had to work together on different occasions. The strange relationship between the Holmes brothers has made way for a couple of theories, among them one that suggests Sherlock was once a secret agent
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