In this serial from the hit sci-fi show, the 4th Doctor Who (Tom Baker) and Romana (Lalla Ward) head for the planet Tigella, where scientists and religious zealots are violently divided over the fate of their world's power source, the Dodecahedron. But the villainous Meglos ensnares the Tardis in a time loop and then adopts the Doctor's physical form in a bid to seize control of the Dodecahedron.

Special Features:

• Commentaries & Meglos Men interviews with writers
• The Scene Sync Story – ‘Meglos’ used a pioneering process called Scene Sync. This documentary looks at the technology behind this precursor to today’s virtual studio productions
• Jacqueline Hill – A Life in Pictures – this documentary looks at the life of an actress whose life was taken tragically early by illness
• Entropy Explained – Dr. Phillip Trowga of the University of Westminster looks at the principle of entropy, key to the plot of ‘Meglos’
• Photo Gallery – production, design and publicity photos from the story