Jeff Stone

Jeff Stone was a mineralogist, and the brother of Andy Stone and Mary Stone.

Biography
Mary, Andy and Jeff 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 he was put to work in a lab at a lead mine until Andy freed him. They then located their sister and freed her as well. Jeff later travelled to Skaro on a mission to gather information on the Daleks. On Pluto, he discovered a way to use the sun's rays to blind, then disarm, the Daleks. Later, he and the other Stones discovered and defeated a Dalek plot to destroy Earth. (DAN: The Dalek Book)