Mission: Impossible (1966) : 3x7

Riva Santel is the recent widow of the President of San Cordova. Deputy Premier Avilla plans to announce free elections but Riva will declare herself dictator in a coup. The IMF must stop her. Pretending to be a film crew, the IMF team gets in. Hostess Cinnamon fakes a collapse and the guys comment on her age. Rollin as a plastic surgeon comes in and Riva finds out Cinnamon is actually seventy years old. She insists on surgery for herself. Since the surgery can only be done on the night of the speech, she has herself taped by her own camera crew. Barney and Willy get hold of the tape footage, reedit it, and switch the IMF tape for Riva's. Riva is sedated during the speech and so her men use the tape. When she awakens, her face in bandages, she is shocked to hear ""herself"" announcing her retirement. While Cinnamon disguised as old-Riva conspicuously leaves the country, Riva takes off the bandages to find she has her wish: she is now a younger woman...with a totally different face.