The Doctor Who episode Midnight was filmed from November 27th - December 11th, 2007. The entire episode was filmed at Upper Boat Studios except for the scenes with Donna at the spa. They were filmed at Dylan's Health Spa at Celtic Manor Resort in Newport Wales. In the photos below you can see that they digitally removed the actual ceiling for the dome that looks out to the planet's sky.
The Doctor uses both Molto Bene and Allons-Y in this episode, it is the first time that he also states that Allons-Y means 'Let's Go'.
Russell T. Davies wrote this episode, he was inspired by the annoying habit that children have of always repeating everything you say. He also stated that he was inspired by the film Jeepers Creepers 2 which was on the TV at the time he was writing. Part of the movie's plot is about a group of high school students trapped in a bus that is being menaced by a hideous creature.
Colin Morgan who plays Merlin in the BBC series of the same name appears in this episode as Jethro Cane. Also appearing, as Professor Hobbes, is the actor David Troughton who is the son of the second Doctor Patrick Troughton.
This is the first time since 1975 that the TARDIS is not seen in an episode of Doctor Who.
We must not look at goblin men,
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
We must not buy their fruits:
Who knows upon what soil they fed
Their hungry thirsty roots?"
This snippet of poem recited in the episode comes from The Goblin Market by Christina Rossetti. You can click on the title to read the whole poem.
The podcast commentary for the episode was done by Paul McFadden, the supervising sound editor, Julian Howarth, the sound recordist and Brin Thomas, second boom operator. You can listen to their words about how difficult this episode was to record.