Big Finish is going to release its first ever seven-part audio adventure, The Annihilators – set, appropriately enough, in the middle of 1970’s Season 7. Season 7 was the first to star Jon Pertwee as the Doctor, alongside Caroline John as Dr Liz Shaw and Nicholas Courtney as the Brigadier. It contained one four-part story (Spearhead from Space) and three sevenparters (Doctor Who and the Silurians, The Ambassadors of Death and Inferno) – the final seven-parters in the series’ history to date.