Extinction (audio anthology)

 was a full cast audio anthology released in 2015 by Big Finish Productions, and the first release of UNIT: The New Series.

Publisher's summary
In this four-story box set, Kate Stewart, Osgood and the UNIT team confront an alien invasion by the Nestene Consciousness and its army of plastic Autons...

1.1 Vanguard by Matt Fitton

From a state-of-the-art bunker beneath the Tower of London, Kate Stewart leads a secret army protecting the Earth from extraterrestrial threat. Crashed UFOs, strange meteors, a giant lizard in the Severn - all business as usual for UNIT.

While Scientific Advisor Osgood attends a 'skyfall' incident with Colonel Shindi and Captain Josh Carter, Kate's duties take her to visit Devlin Future Tech, and reclusive billionaire Simon Devlin.

Journalist Jacqui McGee is also on FutureTech's case, and nothing's going to get in the way of her story: a product launch that will change the world...

1.2 Earthfall by Andrew Smith

Lieutenant Sam Bishop is finishing an assignment in Bangkok when he receives a call from Kate Stewart. She has a new job for him - hunt for a stray Nestene energy unit that has come down somewhere in the Gobi desert.

In Mongolia, Sam is joined by Osgood and they set off into the Gobi. But there are Autons in this desert. They are also looking for the energy unit, and they're ready to kill anyone who comes into contact with it.

Back in London, Kate is becoming suspicious of Simon Devlin's company, and decides to pay him a visit.

1.3 Bridgehead by Andrew Smith

With Nestene energy units falling from the skies around the globe, UNIT's resources are stretched to breaking point as they try to respond.

Josh Carter has gone undercover inside Devlin FutureTech. His safety is jeopardised, however, by the activities of investigative journalist Jacqui McGee.

As the Nestenes progress their plans, Kate becomes a target.

1.4 Armageddon by Matt Fitton

As Autons swarm across the planet, the human race faces its darkest hour. Simon Devlin has helped his alien masters gain a global foothold and their scheme is almost complete.

As UNIT leads the fightback on every front, every continent, against an implacable army, Kate Stewart must look to the past for some clue to defeat the plastic menace.

The Nestene Consciousness is growing in power. It has plans for the human race, and when it achieves its ultimate form, it will be unstoppable. Only UNIT stands between humanity and total extinction...