We uncover how Doctor Who brought Lagos to south Wales to film Inua Ellams's The Story and the Engine, and Steffan has to cater for 250 hungry people on set! Hold tight, there's a lot to discover.

In this penultimate episode, we're having a right hoot on set with owls, ducks and horses. We experience unexpected biting creatures in the forest. Steff's on work experience in the script department and meets production designer Phil Sims.