dual roles on the series-Edward Platt in "Too Many Chiefs"and in "The Spy Who Met Himself"(in both episodes he was very convincing),and Don Adams (also very convincing)in"The Spy Who Met Himself",but did Barbara Feldon play any dual roles on the series,and if so,which episodes?

She played two roles in the fifth season ep. "And Only Two Ninety-Nine". I can't think of any others.