Professor Emil Keller has created a machine that can pacify even the most dangerous of criminals. But when the Doctor and Jo arrive at Stangmoor Prison for a demonstration, things start to go horribly wrong - especially when they discover that the Doctor's old enemy the Master is responsible for the machine.

A look at the appearances of the Daleks and Davros in the classic Doctor Who era.

Don't Lose Your Head is a documentary about the making of Doctor Who story The Reign of Terror.

The War Games saw the end of black-and-white Doctor Who. This documentary examines the artistic limitations - and advantages - of monochrome.

A look at an extraordinary era of musical experimentation within Doctor Who, with special emphasis on the musical scores for Doctor Who and the Silurians and The Sea Devils. Featuring producer Barry Letts, composer Mark Ayres and directors Timothy Combe, Christopher Barry and Michael Briant, with an archive appearance from Radiophonic composer Malcolm Clarke.

Spearhead from Space marked not only the arrival of a new Doctor but also the transition from black and white to colour as the show moved into a new decade. This documentary looks at the challenges faced by programme makers during this period.

Doctor Who directors Michael Briant, Graeme Harper and Tim Combe take an epic road trip to all the filming locations from Season 8 as they discuss directing the show in the early 1970s.