'Survival of the Fittest' (3 Parts) by Jonathan Clements

The hive of the Vrill bears the scars of a terrifying cataclysm. Only a handful remain alive, hatched after the holocaust of the mysterious Winterlack. The Vrill seek a new Authority. They find the Doctor, a two-legged creature who can lead them to survival. He must solve the mystery of the Carrion beast that haunts the lower chambers. He must face the Winterlack that still stalk the mountains. And he must find a path that does not lead to extinction...

Sylvester McCoy (The Doctor), Tracey Childs (Doctor Elizabeth Klein), Adrian Bower (The Authority), Hannah Smith (Rose / The Vrill), Evie Dawnay (Lilly / The Vrill), Mark Donovan (The Watcher), Alex Mallinson (The Carrion), Rupert Wickham (Butterfly)

Directed by John Ainsworth

Release Date:
February 2010

Notes:
*Featuring the Seventh Doctor and Doctor Elizabeth Klein

*A Big Finish Audio Production

*This release also includes the bonus one-part adventure 'Klein's Story', by John Ainsworth and Lee Mansfield, featuring an alternative version of the Eighth Doctor, and Doctor Elizabeth Klein