Castrovalva (Doctor Who)

116^[1] – *Castrovalva*
116 – Castrovalva
Doctor Who serial
Cast
	Doctor Peter Davison – Fifth Doctor;
	Companions Matthew Waterhouse – Adric; Sarah Sutton – Nyssa; Janet Fielding – Tegan Jovanka;
	Guest Anthony Ainley – The Master/The Portreeve; Dallas Cavell – Head of Security; Frank Wylie – Ruther; Michael Sheard – Mergrave; Derek Waring – Shardovan; Souska John – Child;
Production
Directed by	Fiona Cumming
Written by	Christopher H. Bidmead
Script editor	Eric Saward
Produced by	John Nathan-Turner
Music by	Paddy Kingsland
Production code	5Z
Series	Season 19
Running time	4 episodes, 25 minutes each
First broadcast	4 January 1982
Last broadcast	12 January 1982
Chronology
← Preceded by; Logopolis	Followed by →; Four to Doomsday
	List of episodes (1963–1989)

Castrovalva is the first serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 4 to 12 January 1982. It was the first full serial to feature Peter Davison as the Fifth Doctor. The title is a reference to the lithograph Castrovalva by M. C. Escher, which depicts the town Castrovalva in the Abruzzo region, Italy.^{[citation needed]}

In the serial, the alien time traveller the Doctor is led into a trap when his arch-enemy the Master (Anthony Ainley) uses the mathematical abilities of the Doctor's travelling companion Adric (Matthew Waterhouse) to create Castrovalva, a town whose dimensions fold in on itself.

This was the first Doctor Who story not to air on Saturday nights. With Peter Davison taking over as the Doctor, the BBC chose to move the show from its usual Saturday night slot, where it had been since its launch in November 1963. For this new Doctor Who series, the show moved to airing two new episodes per week, on a weeknight prime time slot instead. For Castrovalva, it aired new episodes on a Monday and Tuesday evening.^[2]

^ From the Doctor Who Magazine series overview, in issue 407 (pp26-29). The Discontinuity Guide, which counts the unbroadcast serial Shada, lists this as story number 117. Region 1 DVD releases follow The Discontinuity Guide numbering system.
^ "Schedule - BBC Programme Index".

[1] From the Doctor Who Magazine series overview, in issue 407 (pp26-29). The Discontinuity Guide, which counts the unbroadcast serial Shada, lists this as story number 117. Region 1 DVD releases follow The Discontinuity Guide numbering system.

[2] "Schedule - BBC Programme Index".

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