Doctor Who: Castrovalva

Tom Baker appears in the pre-titles sequence, in the reprise from Logopolis Part Four, but uncredited. This is the first story on which the Doctor is credited as 'The Doctor' on the closing credits. Previously the credit has always read either 'Dr. Who' or 'Doctor Who'.

CASTROVALVA Now disorganized by the regeneration process, the Doctor must make his way to the Zero Room on the Tardis to rest until his regeneration is stabilized. Nyssa and Tegan do not realize that Adric is only a three-dimensional projection created by the Master while the real Adric is his prisoner. It isn't long before the Tardis'' internal temperature begins to rise dramatically and the Tardis is hurtling through the Time Vortex towards certain destruction - towards Event One, the "big-bang" which created the galaxy. The Master appears to have triumphed at last. Greatly weakened by his regeneration, the Doctor makes his way back to the controls and manages to change course, to Castrovalva, a peaceful world where he can rest and recover. The girls construct a Zero cabinet to carry the Doctor in once they leave the Tardis. They end up with Portreeve, the most important citizen of Castrovalva. The Doctor decides to search for Adric, but discovers that Castrovalva is in the grip of Recursive Occlusion. They walk in circles, caught in a space/time trap. Time is folding in on itself and the city has become a temporal treadmill from which there seems no escape. Doctor Who suspects that the Castrovalvan Chronicles are forgeries and that the planet's history has been invented. The girls carry the empty Zero cabinet to Portreeve who in actuality turns out to be the Master and reveals himself when he discovers the cabinet is empty. Castrovalva turns out to be nothing more than a sophisticated metal projection by Adric, under the Master's control. When the Doctor frees Adric, the city begins to disintegrate, the Master is dragged down by a throng of Castrovalvans and the Doctor and his companions escape in the Tardis.

After plummeting from the Pharos Project telescope, the Doctor regenerates. The time travelers escape the Master's clutches, but the Doctor's regeneration is failing, and Adric goes missing in the depths of the TARDIS. Only Nyssa and Tegan can save the day by steering the TARDIS to the city of Castrovalva, renowned for its healing powers. But evil lurks at the heart of this simple paradise.

Cast
The Doctor - Peter Davison
Adric - Matthew Waterhouse
Nyssa - Sarah Sutton
Tegan - Janet Fielding
Child - Souska John
Head of Security - Dallas Cavell
Mergrave - Michael Sheard
Portreeve - Neil Toynay
Ruther - Frank Wylie
Shardovan - Derek Waring
The Master - Anthony Ainley 'Neil Toynay' is an anagram of 'Tony Ainley'. This was the second time in the series' history that a pseudonym had been used for an actor in order to conceal a plot twist (the first instance having occurred on season two's The Rescue)
Production Credits
irector - Fiona Cumming
Assistant Floor Manager - Renny Tasker
Costumes - Odile Dicks-Mireaux
Designer - Janet Budden
Film Cameraman - John Baker
Film Editor - Mike Houghton
Film Editor - Robin Jackman
Incidental Music - Paddy Kingsland
Make-Up - Marion Richards
Producer - John Nathan-Turner
Production Assistant - Olivia Cripps
Production Associate - Angela Smith
Script Editor - Eric Saward
Special Sounds - Dick Mills
Studio Lighting - Ron Bristow
Studio Sound - Laurie Taylor
Title Music - Ron Grainer and the BBC Radiophonic Workshop, arranged by Peter Howell
Visual Effects - Simon McDonald
Writer - Christopher H Bidmead