The Unnamed Traitor (Goodge Street Saboteur / Great Intelligence Operative)

Covert saboteur embedded within Colonel Lethbridge-Stewart's Goodge Street military unit during the Yeti invasion of London Underground. Controlled by the Great Intelligence, this operative—referred to as the 'Unnamed Traitor', 'Unseen Traitor', 'Unseen Saboteur', 'Unseen Figure', and 'Unseen Force'—systematically undermines allied defenses through stealthy sabotage, including unbolting the main door to create vulnerabilities for Yeti attacks. Acts alone in secrecy amid soldiers, scientists, and commanders, prioritizing betrayal over loyalty to advance the Intelligence's infiltration. Key relationships include proximity to the Doctor, Professor Travers, Arnold, Harold Chorley, and the Colonel. Methodical, treacherous, and opportunistic, this operative's actions escalate the crisis by exploiting team crises and internal vulnerabilities. Their actions highlight the vulnerability of internal cohesion in high-stakes military coordination against the Great Intelligence.