The Second Doctor, Ben Jackson and Polly visited Charon at some point in its history. (PROSE: Pluto) In the mid 22nd century, the Earth government funded a research facility at the Charon colony to find useful applications for stunnel technology. On 7 May 2157, the Daleks destroyed the surface of Charon. The scientists based there escaped to Mars with the aid of Chris Cwej. By the 30th century, 800 years later, Charon was still highly radioactive. (PROSE: GodEngine)