Jason King
Uneasy Lies the Head (1x14)
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Having refused to help the British government investigate an international drugs ring Jason is surprised to learn that a man in Istanbul is impersonating him. This turns out to be Trim,a government operative,who has been studying him in order to make contact with the gang leaders and persuade then that he is Jason King. However Trim is captured and Jason has to go to Istanbul after all to save the day.