Sadie Miller and Daisy Ashford star as Sarah Jane Smith and Liz Shaw, alongside Tim Treloar as the Third Doctor and Jon Culshaw as the Brigadier, in the seventh volume of Big Finish’s The Third Doctor Adventures.

In The Unzal Incursion by Mark Wright, the Brigadier, Dr Liz Shaw and UNIT are getting ready to activate Hotspur, their new early-warning system. But something goes wrong, and the Doctor, Liz and the Brigadier become fugitives. Their investigations lead them to the Fulcrum military training facility – and something beyond the Earth…

In The Gulf by Tim Foley, the TARDIS lands on an ocean planet and the Doctor and Sarah find themselves stranded on a former rig, recently converted into an artistic retreat. When a troubled member of the collective disappears, the Doctor senses a sinister psychic presence…

The Third Doctor Adventures: Volume Seven is out now from bigfinish.com – RRP £24.99 on CD and £19.99 to download.

We have FIVE copies to give away. If you’d like the opportunity to win one, give us the right answer to the following question:

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The competitions open on Thursday 27 May 2021 and close at 23.59 on Wednesday 23 June 2021. One entry per person. The competitions are not open to employees of DOCTOR WHO MAGAZINE or anyone else connected with DWM, the printers or their families.

Winners will be the first correct entries drawn after the closing date. No purchase necessary. DWM will not enter into any correspondence. Winners’ names will be available on this website. Entrants under 16 years of age must have parental permission to enter. To read the BBC’s code of conduct for competitions and voting visit https://www.bbc.com/editorialguidelines/guidance/code-of-conduct. Prizes will be sent to winners as soon as possible. However, due to the Coronavirus lockdown restrictions there may be a delay in dispatching some items.