Purity Undreamed (audio anthology)

 was a full cast audio anthology released in 9 August 2022 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, Cherylee Houston as Elise and introduced Toby Hadoke as Ron and Imogen Stubbs as Patricia McBride.

Publisher's summary
The Sixth Doctor heads back to Earth with Mel and Hebe in tow, little dreaming what lies ahead. Accompanied by their new friend, Professor Patricia McBride, alien threats abound, dangers lurk, and the cost of meddling with time is more than anyone is prepared to pay.

2.1 The Mindless Ones by Paul Magrs

The Doctor, Mel and Hebe visit Sheffield at the behest of Hebe's best friend, Elise, but Elise has undergone a disturbing transformation. The mysterious Mindless Facility claims to be able to change you for the better – but who decides what that is? Joining forces with anthropologist Professor Patricia McBride, can the Doctor and his friends save Britain from an insidious alien threat?

2.2 Reverse Engineering by Jonathan Morris

When Patricia is invited to a secretive Swedish clinic by an old colleague, she tips off the Doctor, Mel and Hebe, who go undercover to investigate. Charismatic geneticist Killian Holm offers to restore youth to his wealthy patients, but the truth of his work is far more radical – and far more dangerous! As an ancient horror reforms beneath the clinic, the Doctor must race to save humanity from an unspeakable temporal disaster.

2.3 Chronomancer by Robert Valentine

The Doctor, Mel and Hebe take Patricia to see 26th century Sheffield, but their trip is cut unexpectedly short. Caught in the crossfire between time-criminal, Khavûl, and dashing 'chronomancer', Tannus Vallon, the TARDIS crash-lands back in the present. With a dimensionally transcendental artefact lost somewhere in the city, the Doctor and his friends must find it before Khavûl can… but with resentments and prejudices finally unmasked, is an even bigger threat about to engulf the world?

Featured actors

 * Colin Baker
 * Bonnie Langford
 * Ruth Madeley
 * Imogen Stubbs
 * Cherylee Houston
 * Toby Hadoke