Big Finish are pleased to unveil the trailer for Doctor Who: Return to Telos, the series finale to Tom Baker's fourth audio run as the legendary Time Lord.

After beginning the story in July's Doctor Who: The Fate of Krelos, Nicholas Briggs's concluding instalment pits the Doctor against a loyal companion; while crossing paths with another – Jamie McCrimmon!

The Doctor reveals to Leela that they’re heading for the planet Telos. And K9 has new masters...

On Telos, in the past, the Second Doctor and Jamie are exploring the ‘tomb of the Cybermen’.

Meanwhile, the Cyber-Controller and Cyber-Planner consolidate their plans. Spare parts from Krelos are being used to construct a mighty Cyber army. The Doctor must be captured.

Out of control, the TARDIS tumbles down a chasm and the Doctor and Leela find themselves caught up in full-scale planetary invasion. 

Doctor Who: Return to Telos stars Tom Baker, Louise Jameson, John Leeson and Frazer Hines, with Nicholas Briggs as the Cybermen. Pre-order your copy today, and catch up on the series so far on the Fourth Doctor Adventures range page.

The Fourth Doctor will return with Romana in Doctor Who: Wave of Destruction, the first of a fifth series available from January 2016.