The Fourth Dimension
The Beast Below
Liz Ten refers to the fact that the Doctor has encountered members of the royal family in his travels. She mentions Queen Victoria who knighted then exiled the Time Lord in Tooth and Claw and Queen Elizabeth I whom we glimpsed in The Shakespeare Code. Additionally we saw Queen Elizabeth I in the First Doctor adventure The Chase and the Seventh Doctor spots Queen Elizabeth II in Silver Nemesis. You can find out more about Queen Victoria, Queen Elizabeth I, and the current Queen in the BBC's online History pages.
Magpie Electricals first featured in The Idiot's Lantern and their logo has appeared briefly in several episodes but now we know the business survives into the far distant future! The company is definitely represented on Starship UK as their logo is clearly visible in one of the craft's public areas.
The Beast Below was created in Block Two of the new series' production schedule. The read-through of the episode took place on the morning of on August 20th, 2009.
The Beast Below is the first episode since June 11, 2005 not to feature the Tenth Doctor. Every episode since Bad Wolf has featured him in some way, including a visual reference to him in The Eleventh Hour. It's the first episode since The Stolen Earth (June, 2008) to have a duration of approximately 45 mins (not counting the amalgamated version of Dreamland!) And excluding stories where the Doctor's ship is entirely absent, it's the first since the TV Movie in 1996 not to feature the TARDIS exterior as seen from Rose to The Eleventh Hour.
It's another episode where there are no onscreen deaths. In Steven Moffat's first story, The Empty Child/The Doctor Dances, there was also a zero death count - or as the jubilant Doctor put it, 'Everybody lives!' Earlier adventures where everybody survives includes The Edge of Destruction, a First Doctor story set almost entirely onboard the TARDIS.
The Beast Below is directed by Andrew Gunn. This is his first Doctor Who episode although he also directed next week's adventure, Victory of the Daleks.
At the close of the episode we see Winston Churchill, as played by Ian McNeice. One of his biggest film roles came in the 1994 comedy, Ace Ventura: When Nature Calls. That movie co-starred Sophie Okonedo who here plays Liz Ten and Simon Callow who portrayed Charles Dickens in The Unquiet Dead.