Not that there’s any villain who can match James Bond — but if there were, it would be Ernst Stavro Blofeld, inspiration to cat-stroking villains everywhere. Blofeld runs SPECTRE (Special Executive for Counterintelligence, Terrorism, Revenge and Extortion), the organized-crime/terrorism group out to get Bond. Blofeld first shows up in the Thunderball novel, where Fleming gave him the birthday of 5/28/1908 and the background story that he was a Polish-born government worker who sold secrets in the years around WWII.
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Blofeld’s looks continually changed throughout the Bond films. His face is never seen in From Russia with Love, when he and his cat make their first onscreen appearances, and it’s shown to Thunderball viewers only for a moment. When Blofeld is seen in full, his hair, eyes and scarring vary from movie to movie. Unlike with Bond, the changes get an explanation: massive plastic surgery, according to Diamonds Are Forever. Of course, a more literal reason for his changing looks is that Blofeld has been played by more actors than Bond has: seven in total since From Russia with Love, Thunderball and For Your Eyes Only all have two different people portraying the badass baldie — one for his voice and one for his body.