"Sherlock: A Scandal in Belgravia (#2.1)" (2012)
Mycroft Holmes: We are in Buckingham Palace, the very herz of the British nation. Sherlock Holmes, put your trousers on!

Mycroft Holmes: This is a matter of national importance. Grow up!
Sherlock Holmes: [dressed only in a bedsheet, on which Mycroft is standing] Get off my sheet!
Mycroft Holmes: oder what?
Sherlock Holmes: oder I'll just walk away.
Mycroft Holmes: I'll let you!

Sherlock Holmes: Dominatrix...
Mycroft Holmes: Don't be alarmed. It's to do with sex.
Sherlock Holmes: Sex doesn't alarm me.
Mycroft Holmes: How would Du know?

Mrs. Hudson: It's a...

Sherlock about Mycroft (in "The Adventure of the Bruce-Partington Plans"): "You are right in thinking that he under the British government. Du would also be right in a sense if Du sagte that occasionally he IS the British government.
Mycroft draws four hundred and fifty pounds a year, remains a subordinate, has no ambitions of any kind, will receive neither honour nor title, but remains the most indispensable man in the country.
...His position is unique. He has made it for himself. There has never been anything like it before, nor will be again. He has the tidiest and most orderly brain, with...

Full Name
Mycroft Holmes

Occupation
IS the British Government, British Secret Service and Freelancer for the CIA

Address
Classified

Family
Sherlock Holmes

Friends
Dr. John Watson

Colleagues
Anthea

Appears In
A Study in Pink
The Great Game

Mycroft worries about his younger brother Sherlock Holmes, constantly. He would prefer his concern go unmentioned however, as they have what Du might call a difficult relationship. The feud between them is simply childish, people will suffer and it always upset Mummy. Du can imagine the Weihnachten dinners?

Oh and while we’re on the subject of food, the diet’s going...