For the next 48 hours only, enjoy a seasonal discount on a good old-fashioned war story. Doctor Who: The King of Sontar is available to download for just £2.99!

Dowcra base. The third Elite Sontaran Assassination Squad closes in on its target. A dozen trained killers, but even they will be unable to bring down the invincible Strang…

Manipulated by the Time Lords, the TARDIS also arrives on Dowcra. And the Doctor is set to encounter the greatest Sontaran ever cloned...

Written by John Dorney and starring Tom Baker, Louise Jameson, Dan Starkey, David Collings, John Banks, David Seddon and Jenny Funnell, you can download Doctor Who – The Fourth Doctor Adventures: The King of Sontar today for just £2.99.

Four series of Fourth Doctor Adventures are available to order now from the Big Finish website. Series 5 begins in January with Doctor Who: Wave of Destruction, starring Tom Baker, Lalla Ward and John Leeson. For more details and the chance to subscribe, click here.

And don't forget – throughout the entire 12 Days of Big Finishmas, we're offering our money-saving Doctor Who Super Subscription – 42 titles from just £325, including releases extending all the way to 2020! Click here for more information.

Check back tomorrow for the sixth day of Big Finishmas!