In his next alien insect encounter, the Time Lord travels back in the TARDIS to medieval England.
Part of a five-story adventure written by Paul Magrs.
Starring Tom Baker as the Fourth Doctor, Richard Franklin as Mike Yates, Susan Jameson as Mrs Wibbsey, Claire Corbett as the Nun, Suzie Riddell as the Sister and Rula Lenska as the Swarm.
Producer: Kate Thomas
Made by BBC Audio.