Coming in July and August, the Fourth Doctor Adventures Series Five concludes with the return of some powerful old enemies - and a fatal trip for one of the TARDIS crew!

Written by Big Finish Executive Producer Nicholas Briggs, these final two adventures in The Fourth Doctor Adventures Series Five will see the Doctor (Tom Baker), Romana (Lalla Ward) and K9 (John Leeson) face off against their old enemy Cuthbert, once again played by national treasure David Warner.

Cuthbert's last encounter with the Time Lord in Doctor Who: The Final Phase saw him cast back through history – but now he's ready to take his revenge, from the heart of 19th Century Yorkshire! Also returning is the villain's loyal assistant Mr Dorrick (Toby Hadoke) and the innocent race of aliens known as the Laan (Jane Slavin); who were first dragged into the Conglomerate's plans in the Series 2 stories Doctor Who: The Sands of Life and Doctor Who: War Against the Laan.

And to make matters worse, another old adversary has finally caught up with the TARDIS. The Black Guardian (David Troughton) has returned after his defeat in the TV story The Armageddon Factor. Can the Doctor, Romana and K9 survive?

You can pre-order both Doctor Who: The Pursuit of History and Doctor Who: Casualties of Time today directly from the Big Finish website – with a money saving subscription of The Fourth Doctor Adventures Series 5 also available. And remember, when you choose to buy this release on CD directly from Big Finish, you will also unlock instant access to a digital copy for download.

Four previous series are still available to order now, with special bundles available on each. For another Big Finish battle between the Fourth Doctor and the Black Guardian you can also order Doctor Who: The Well-Mannered War, based on the novel by Gareth Roberts and also available as part of a special edition box-set alongside Russell T Davies' Doctor Who: Damaged Goods.