'The Imposters' (6 Parts) by Alan Barnes

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!

Tim Treloar (The Doctor), Sadie Miller (Sarah Jane Smith), Daisy Ashford (Liz Shaw / Imposters), Jon Culshaw (Brigadier Lethbridge-Stewart), Grace Darling (Jessamine Curbishley), Gary Turner (The Minister), Simon Kane (Sam Samsonson), Mark Elstob (Major-General Maupassant / Wrestling Commentator), Samuel Clemens (Lieutenant Gurney), Lara Lemon (The Arbiter / Headmistress / Computer), Miranda Barnes (Knights / Annabel)

Directed by Nicholas Briggs

Release Date:
February 2026

Notes:

*Featuring the Third Doctor, Sarah, Liz, Brigadier Lethbridge-Stewart and UNIT

*A Big Finish Audio Production

*Time-placing: Very late in Season 11, after 'Kaleidoscope'