Bio

Mycroft claims to merely "occupy a minor position in the government". However, according to Sherlock, he occasionally is the British Government, functioning as the control centre or "clearing house" for all government actions and decisions. Mycroft tells John that Sherlock may even consider him his arch-enemy. Sherlock neither confirms nor denies this statement.

There are signs throughout the series that Sherlock Holmes is right about Mycroft's high position in the UK Government, such as his ability to control CCTV cameras at will. He also is shown to have the ability to hack into cash machines and make them display messages he wants the user to see.

Mycroft has a habit of kidnapping people to talk to them, instead of using more conventional methods. He has very good connections; it is implied by Sherlock that he knows the Queen, when Sherlock starts to play "God Save the Queen" on his violin, and he is able to pull strings to allow Sherlock access into a top secret military base. In this episode, it is also asserted that his priority level is "Ultra". Unlike his brother, Mycroft is also known to only text when he cannot talk.

Mycroft occasionally warns John when he thinks that it is a "danger night" with Sherlock ("A Scandal in Belgravia"), and has John search the house. On those nights, he needs John to stay at home with Sherlock (and look out for him). However, Sherlock knows that John has been searching his stuff, and may be aware of what Mycroft has done (and asked John to do).