A human with a troubled past, Ace (real name Dorothy) was a companion to the Seventh Doctor, Sylvester McCoy. She had a talent with chemistry and carried around a chemical called 'Nitro-9' as a weapon. Due to her past, Ace developed a tough exterior - though she had a soft heart and was very protective of the Doc.
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Doctor Who series six airs Saturdays at 7pm on BBC One
