Mary Stone

Mary Stone was a biochemist, and the sister of Jeff Stone and Andy Stone. They resided in [New Paris]], Venus, but were on holiday in the planet's Churchill Mountains when the Daleks attacked. Jeff and Mary were captured and she was put to work, first on an oil well, then at Winston Dam until she was freed by Andy and Jeff. Mary and Andy were later captured by Daleks on Gurnian and forced to approach a group of Horrorkons, which they later used to defeat the Daleks. On Jupiter, she developed a new form of acid which ate through Dalek casings. Later, she and the other Stones discovered and defeated a Dalek plot to destroy Earth. (DWA: The Dalek Book)