Lucy Benjamin

Born in Reading, Berkshire, England, she took the stage name of Benjamin after her brother. Benjamin trained at the Redroofs Theatre School in Maidenhead. Her first acting role was as a child actress in Doctor Who in 1983, playing a younger version of the character Nyssa in Mawdryn Undead. She remained uncredited both onscreen and in Radio Times for this part, despite having dialogue albeit one word Doctor

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Source: Wikipedia