The Adventure of the Greek Interpreter Sherlock Holmes, far from being a one-off in terms of his powers of observation and deductive reasoning, in fact has an elder brother whose skills, or so Holmes claims, outstrip even his own. As a consequence of this, Watson becomes acquainted with the Diogenes Club and his friend's brother, Mycroft. Mycroft, as Watson learns, does not have the energy of his younger brother and as a consequence is incapable of using his great skills for detective work: In spite of his inertia, the elder Holmes has often delivered the correct answer to a problem that Sherlock has brought to him.
Adaptations of Sherlock Holmes Conway played Sherlock Holmes opposite Nigel Bruce for one season. After a change of networks, there were two more pairings: John Stanley as Holmes and Alfred Shirley as Watson in 1947–1948 and Stanley and "George Spelvin" in 1948–1949. Both Stanley and Conway emulated Rathbone when performing Holmes to aid in continuity for the audience. John Gielgud played Holmes for BBC radio in the 1950s, with Ralph Richardson as Watson. Gielgud's brother, Val Gielgud, appeared in "The Bruce-Partington Plans", perhaps inevitably, as Mycroft Holmes. As this series was co-produced by the American Broadcasting Company, known American actors also appeared, such as