Doctor Who Series 10: 11 Easter Eggs & References You Might've Missed In 'Thin Ice'
9. Doctor Disco
When infiltrating Lord Sutcliffe's house, the Doctor introduces himself as Doctor Disco from the Fairford Club.
This is the third time he has gone by this alias. The first time was in The Zygon Invasion when he jokingly called himself Doctor Disco when leaving a voicemail message on Clara's phone. In the following episode, The Zygon Inversion, the Doctor called himself Doctor John Disco when talking to a pair of police officers.
Apparently, the classic non-de-plume of John Smith is just too boring for the Twelfth Doctor.