Pujol operated as a double agent under the XX Committee's aegis; Cyril Mills was initially Bovril's case officer; but he spoke no Spanish and quickly dropped out of the picture. His main contribution was to suggest, after the truly extraordinary dimensions of Pujol's imagination and accomplishments had become apparent, that his code name should be changed as befitted 'the best actor in the world'; and Bovril became "Garbo", after Greta Garbo. Mills passed his case over to the Spanish-speaking officer Harris.