Purity Unleashed (audio anthology)

 was a full cast audio anthology released on 23 May 2023 by Big Finish Productions as part of The Sixth Doctor Adventures. It featured Colin Baker as the Sixth Doctor, Bonnie Langford as Melanie Bush, Ruth Madeley as Hebe Harrison and Imogen Stubbs as Patricia McBride.

Publisher's summary
The Sixth Doctor and Mel are on a rescue mission, in three new adventures.

1. Broadway Belongs to Me! by Matthew Sweet

The Doctor and Mel begin their search for Hebe in 1930s New York, where history is taking a dark turn all of its own. On Broadway, they discover a genuine aberration of the timestreams: Behold America! – a hot shoe show set in a future Fascist United States. Starring Melanie Bush. Opening tonight...

2. Purification by Chris Chapman

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.

3. Time-Burst by Ian Potter

Tracking the anomaly that erased Hebe from history, the Doctor and Mel find an instability in Sheffield, 1864. Who is Mrs Virtue, the mysterious owner of the new steelworks? And can the Doctor untwist history before a natural disaster washes them all away...?

Featured actors

 * Colin Baker
 * Bonnie Langford
 * Ruth Madeley
 * Imogen Stubbs