Geoffrey Hughes

Geoffrey Hughes (2 February 1944-27 July 2012 ) played Mr. Popplewick in the Doctor Who story The Ultimate Foe. He is also well-known as Onslow, Hyacinth Bucket's slovenly brother-in-law on the BBC sitcom Keeping Up Appearances and previously for playing the equally slovenly Eddie Yates in Coronation Street. He provided the voice of Paul McCartney in the Beatles' film Yellow Submarine. In 2009 and again in August 2010, he was taken to hospital with prostate cancer. He died on 27 July 2012.

As Mr Popplewick was an alias of the Valeyard and the Valeyard was, according to the Master, "an amalgamation of the darker side of the Doctor's nature", taken from somewhere between his "twelfth and final incarnations", Geoffrey Hughes is technically a credited actor employed by the BBC to play the Doctor.