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Friendly Middle Eastern potentate King Selim (Lloyd Battista) has been imprisoned by his lookalike brother Prince Samandal (also Lloyd Battista), the better to usurp Selim's throne and hand over the kingdom to enemies of the West. To rescue Selim and restore the status quo of his country, the IMF must throw a good scare into Samandal. Posing as a doctor, Phelps uses all the medical trickery at the IMF's disposal to accomplish his task. Michele Carey guest stars as female IMF agent Lisa, here impersonating an actress named Irina. Originally broadcast December 7, 1969, "The Brothers" was scripted by Leigh Vance, from a story by Robert C. Dennis.