Inferno

Inferno has a story line. There is a project dedicated to penetrating the Earth's crust in order to tap a new energy source located beneath it. The Doctor notes the dangers that Professor Stahlman, the project director refuses to heed. However, things are already going wrong. A green slime is coming out of the drilling shaft, which infects anyone who touches it, turning them into sub-human monsters. When the Doctor tries to reactivate the TARDIS he is transported into a parallel universe where the drilling is more advanced. A fascistic government seems to rule Britain and familiar faces mask unfamiliar personalities. It is there that the Doctor realises the full extent of the danger that the drilling will unleash. It's a perfectly respectable story line that would be easy to make into a good Doctor Who story. However, Inferno is not a good Doctor Who story. It's an absolutely fantastic one.

The main reason for this is this is that this story probably has the finest guest performances the programme has ever seen. Every single one of the main speaking roles is impeccably performed. Derek Newark makes Sutton likeable and very exciting to watch. Olaf Pooley plays Stahlman as stubborn and obsessed but not actually evil and Sheila Dunn makes a thoroughly reactive character like Petra seem genuine. We can see the impact of the events in the story in the faces of the characters and in the way that they interact, which means that we are with them all the way. The 'evil parallel universe' idea is not a new one, but it has rarely been done better than here. Don Houghton rightly portrays it as an evil society, but not full of naturally evil people. Some are considerably different (Lethbridge-Stewart, Benton) others only different by the circumstances of life (Liz). Again the actors put their all into these roles. The alt-Greg Sutton has a very slightly more formal manner of speaking, even though the character is a maverick. Section Leader Shaw is the same person, but brought up to believe in a separate set of values. And, of course, the Brigade Leader is a chilling perversion of the Brigadier we have grown to love, an excellent performance by Nicholas Courtney.

Houghton's script is very well written, with many lines of memorable dialogue. The blossoming romance between Greg and Petra is beautifully written and played in both universes. And, of course we see the Doctor faced with an apocalyptic situation- and fail. The world is, indeed, destroyed in the alternative reality, which adds to the intensity of the story. The production values are excellent. Douglas Camfield has a great eye for a great shot and the editing and photography are first rate, with very effective use of filters for the apocalyptic scenes for episodes 5 and 6. The use of stock music, rather than a score, creates a spooky ambience that is very powerful. And, of course, there is the ever present sound of the drilling.

Jon Pertwee is absolutely astonishing as the Doctor throughout, the intensity of his performance matching that of the story. While he fails to save the alternate Earth, he does manage to inspire several of its inhabitants to be better people before they die, perhaps the most 'Doctorish' thing he could do.

The Primords are not very effective, truth be told. But I really don't care. This is one of the best Doctor Whos of all time, a fantastic end to the best season since the Hartnell era.

NEXT: Terror of the Autons