Bernice Summerfield (clone)
President Bernice Summerfield was a clone of the real Bernice Summerfield who became President of Earth.
She was created as part of a plot to take over the Earth government and was sent to kill the real Bernice, but thanks to Bernice herself and Kadiatu Lethbridge-Stewart she was able to overcome her programming and gain independence. She was eventually elected President of Earth. (AUDIO: The Final Amendment)
The real Bernice was occasionally mistaken for her clone, and on one occasion impersonated her, in order to avert a military crisis between Venus and Eros. (AUDIO: Venus Mantrap)
The President was eventually killed by Frost to send a message to the original Bernice. (AUDIO: Venus Mantrap, Secret Origins)