Purification (audio story)

 was the second story in the audio anthology Purity Unleashed, produced by Big Finish Productions. It was written by Chris Chapman and featured Colin Baker as the Sixth Doctor, Bonnie Langford as Melanie Bush and Imogen Stubbs as Patricia McBride.

Publisher's summary
The Doctor and Mel follow the trail to a port in New Zealand, 1910. A ship is being prepared for a journey to Antarctica and the Doctor realises that this is Captain Scott's Terra Nova expedition. But this is merely the beginning of an intricate scheme to rewrite the future of humanity.

Plot
to be added

Cast

 * The Doctor - Colin Baker
 * Mel - Bonnie Langford
 * Patricia McBride - Imogen Stubbs
 * Elizabeth / Martha - Leah Brotherhead
 * Thomas Rodden - Jonny Weldon
 * Jasper Woodward / Sir Gerald / Toby / The Harbour Master - Greig Johnson

Continuity
to be added