Felix Leiter is a fictional character created by Ian Fleming in the James Bond series. He is James Bond's CIA ally and friend, who played a part in six of the Fleming novels; he is introduced in "Casino Royale" as being thin, tall, about thirty-five years old and a former U.S. Marine who was working with the Joint Intelligence Staff of NATO. Fleming named the character after two of his American friends: "Felix" was Ivar Bryce's middle name, whilst Tommy Leiter was a mutual friend.

Leiter is Bond's saviour in "Casino Royale", providing him with 32 million francs when Bond has been cleaned out by SMERSH paymaster Le Chiffre, calling it "Marshall Aid". Media historian James Chapman notes that Bond's relationship with Leiter represented the Special Relationship between Britain and America, although the American Leiter is in the subordinate position to the British Bond.

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