"Traitor!" is the twenty-ninth episode of Gerry Anderson's Captain Scarlet And The Mysterons. A series of hovercraft crashes at the Spectrum Organisation training academy, Koala Base, is followed by Mysteron claims of a traitor amongst Spectrum personnel. This motivates its superintendent, Major Stone, to ask Colonel White for assistance. The Colonel dispatches Captain Scarlet and Captain Blue there, ostensibly as guest lecturers.