Head of Security
Factual Error: Nyssa, a scientist, claims they are travelling to "the creation of the Galaxy out of a huge inrush of hydrogen". She means the Universe, not the Galaxy.
Revealing Mistake: When the Doctor levitates in the Zero Room, his collar question marks are reversed and his hair is parted on the wrong side.
There are a number of minor continuity errors between this episode and Logopolis: the guards are different, the TARDIS has landed in a different field, Tegan's handbag appears on the TARDIS console, the weather changes, etc.
The Doctor's boots change when he regenerates, becoming shoes. This was apparently because Tom Baker's boots were too big for Davison.
Tegan [ regarding the data bank ]: Will it tell us how to fly the TARDIS?
Nyssa: I'm sure that's in there, somewhere. Once we find the index file.
Tegan: How do we find the index file? 'Course, if we had an index file, we could look it up in the index file, under "index file"!
The Doctor: Have you ever been to Alzarius?
Adric: I was born there.
The Doctor: Really? It's a small universe, isn't it?
The Doctor: I'm the Doctor. Or will be, if this regeneration works out…
The Doctor [ gazing in mirror] : That's the trouble with regeneration. You're never quite sure what you're going to get.
Nyssa: I suppose it's some sort of neutral environment. An isolated space cut off from the rest of the universe.
Tegan: He should have told me that's what he wanted. I could've shown him Brisbane.
Novelisation: Doctor Who - Castrovalva by Christopher H. Bidmead (ISBN 0 426 19326 1) first published by W H Allen in 1983.
DVD: Doctor Who: Castrovalva released (along with The Keeper Of Traken and Logopolis) as part of the Doctor Who: New Beginnings box set (BBCDVD 1331) on 29 January 2007. Released in U.S.A./Canada on June 5 2007.
Video: Doctor Who: Castrovalva (BBCV 4737) released in March 1992. Released in U.S.A./Canada (Warner Home Video E1144) in October 1993.
The working title for this serial was The Visitor.
This episode was also a replacement for a story entitled Project Zeta-Sigma, written by John Flanagan and Andrew McCulloch and which was later abandoned.
In the first major change to Doctor Who scheduling, the programme was no longer to be broadcast early on Saturday evenings, but instead twice-weekly, on a Monday and Tuesday evening (later to be switched to other weekdays).
This was the first episode in which a pre-titles sequence was used, here a revised version of the ending of Logopolis featuring the Doctor's fourth regeneration.
For the first time, the principal actor is credited as "The Doctor" in the end credits, as opposed to "Dr. Who" or "Doctor Who".
First full appearance Peter Davison as the Doctor.
While wandering in a daze after regeneration, the Doctor refers to a number of past experiences. He mentions past companions Romana, The Brigadier, Jamie and Vicki, as well as past locales he visited: Alzarias (Full Circle)and Logopolis. He also mentions his old enemies the Ice Warriors. In addition, before trying on his new outfit, The Doctor finds a recorder and tries out a few notes. Playing the recorder was a hobby of the second Doctor.
The title of this story comes from a print by reknowned Dutch artist M.C. Escher who was much celebrated for his use of impossible perspectives and optical illusions. The full significance of this allusion becomes clear in episodes three and four when the collapsing world of Castorvalva takes on a distorted appearance reminiscent of Escher's work.
User Score: 22049
User Score: 6038
User Score: 2242
User Score: 528
User Score: 522
User Score: 151
User Score: 113
User Score: 89
User Score: 88
User Score: 84
User Score: 83
User Score: 80
User Score: 60
User Score: 57
User Score: 57
User Score: 56
User Score: 53
User Score: 52
User Score: 39
User Score: 38