Walter Simeon Dr Walter Simeon was a man associated with the Great Intelligence , a faceless entity who went on to use his image as a body long after Simeon ' s death . Biography . Walter Simeon found the Great Intelligence as a young boy , and unwittingly began pouring his darkest thoughts into it . Simeon grew up and became a scientist , he believed that the snowmen ' s orders to be its own rather than a reflection of himself , Simeon began to go about building an army of ice for himself to be in power . To this end he established the Great Intelligence Institute and sought to bring the Ice Governess to the Intelligence , which brought him up against the Doctor . When he confronted him at the Institute , the Doctor showed him how the Intelligence was nothing more than a reflection of Simeon himself rather than a separate entity . Undaunted by this revelation , Simeon sought to get the remains of the Governess , but the Doctor tricked him into being bitten by a memory worm . The memories of his adult life were erased , but the Intelligence had by this time gained enough independence to survive and fill in the void left and take over Simeon ' s body . After a brief scuffle with the Doctor , whatever was left of Simeon died when the Intelligence was defeated and relinquished control of his body . ( TV : " The Snowmen " ) The Great Intelligence using Simeon ' s image . Although Simeon ' s physical body had died , the Great Intelligence used his image as an avatar to communicate with Miss Kizlet via a large wall - mounted video screen at the Shard . ( TV : " The Bells of Saint John " ) The Great Intelligence would later appear in the form of Simeon on Trenzalore accompanied by the Whisper Men , who wore the same attire as Simeon , the reason for this was revealed when he destroyed his own body and immediately after manifested in a Whisper Man whose blank face turned into that of Simeon ' s . ( TV : " The Name of the Doctor " ) The Intelligence used the Simeon avatar twice more - once when it escaped the Doctor ' s timeline and arrived in 1937 before three boys in Draynes Wood , Cornwall ( including an eight - year old Alistair Lethbridge - Stewart ) , and later in 1969 for a final confrontation with the adult Colonel Lethbridge - Stewart . ( PROSE : " The Forgotten Son " ) Personality . Walter Simeon was a cold hearted sociopath , and , to the utmost represented part of his personality , a misanthrope . As a child , he believed that other children were " silly " and didn ' t want to play with them . His mother commented that his solitary nature was unhealthy , and since Simeon never even tried to emotionally connect with other people he grew into a heartless man who showed very little emotion . He allowed his Snowmen to eat a group of homeless people who had been building them without any concern for their lives , coldly stating , " I said I ' d feed you . I didn ' t say who to . " An intelligent and very power hungry man , Simeon was determined to take over the world with his ice army , although for most of his life he thought he was obeying the orders of the Great Intelligence , not realising that it was a reflection of himself . The one time he did show emotion was when he realised who and what the Great Intelligence was , seeming shocked and slightly fearful of the entity he had served for almost his entire life . Nonetheless , this did not stop him from trying to dominate the world , which he and the Great Intelligence had been working towards for fifty years . Simeon was also shown to be arrogant and casually informed Vastra and Jenny Flint of his plan , believing that there was nothing they could do to stop it . When Vastra said she knew someone who could stop him , Simeon merely responded , " I look forward to meeting him " , not taking the Silurian ' s words seriously . He was also indifferent when he lifted Vastra ' s veil and saw she was a Silurian . ( TV : " The Snowmen " )