Doctor Who: The Third Doctor Adventures: The Imposters

For The Love Of StoriesBig Finish produce fantastic full-cast audio dramas for CD and download.

Doctor Who - The Third Doctor Adventures

Released February 2026

Written by Alan Barnes

Starring Tim Treloar Sadie Miller

From US $27.04

About
Backstage
Cast
Production Credits

This title was released in February 2026. It will be exclusively available to buy from the Big Finish website until 31 March 2026, and on general sale after this date.

The Doctor and the Brigadier are on the trail of stolen, advanced technology. Sarah Jane Smith is convinced an informant is leading her to a top-secret space tracking station. And Dr Elizabeth Shaw is wearing a metal helmet, covered in tin foil.

It's a deadly puzzle, involving a precocious schoolgirl, a Saturday night all-in wrestling star and a high-ranking military officer. There's a plot to control the Earth's weather and somewhere in all this, there's a connection to the constellation of Centaurus.

To defeat an enemy with no regard for human life, the Doctor must battle on all fronts, but not before a lethal encounter with the Venusian karate Downward K-klak! 

Brigadier Alistair Lethbridge-Stewart © Haisman & Lincoln and used under licence. With thanks to Hannah Haisman and Candy Jar

**Please note: the collector’s edition CD box set is strictly limited to 1,500 copies and will not be re-pressed.**

Recorded on: 15-17 July 2025

Recorded at: The Soundhouse

Producer Lizzie Worsdell said: "I’m so excited and grateful to be producing my first Doctor Who story for Big Finish. For the first time ever, Sadie Miller and Daisy Ashford unite as Sarah Jane Smith and Liz Shaw in a brand-new Third Doctor adventure.

"The Imposters is packed with a big cast, thrilling new characters, 1970s TV nostalgia, and even wrestling! Featuring the incomparable writing of Alan Barnes and direction of Nicholas Briggs, it’s bold, fun, and full of heart."

Writer Alan Barnes added: "It was an absolute joy to put the Third Doctor, the Brigadier and Sarah together with Liz Shaw, who's not been idle since she left UNIT... as you’ll hear. The Imposters had a very unlikely starting point: I wondered what would happen if the Doctor met another of the superstars of 1970s Saturday afternoon TV. Someone like Big Daddy, or Giant Haystacks, or Rollerball Rocco. Yes, we’re going all-in with the wrestling!"

Lead actor Tim Treloar said: "This story is very exciting. It's so full of humour. Alan's scripts are always brilliant and very easy to perform. Working with Sadie and Daisy at the same time, what a handful - double trouble! It's lovely acting alongside both of them."

Daisy Ashford, who plays Liz Shaw, added: "It's different from other stories I've worked on because it's essentially a Sarah Jane story that Liz has stumbled upon. But there's something liberating about that for Liz, in that she's not tied to this team and yet she slips into it nicely.

“It’s been brilliant working with Sadie. We get on terribly well, but we've never actually been in studio together before. She sounds so much like her mum and it's just wonderful to watch her work."

And Sadie Miller, the voice of Sarah Jane Smith, said: "Getting Sarah and Liz together is something that I've been waiting for for a long time. It's been lovely working with Daisy, getting to hear her in person. I've listened to some of Daisy's audios and I think she sounds so like her mum, but to hear it in person is lovely."

Jon Culshaw, Daisy Ashford, Tim Treloar, Sadie Miller

Lizzie Worsdell, Alan Barnes, Jon Culshaw, Samuel Clemens, Daisy Ashford, Sadie Miller, Tim Treloar, Miranda Barnes, Grace Darling, Gary Turner, Lara Lemon, Simon Kane, Mark Elstob