Theory:Doctor Who television discontinuity and plot holes/The Tenth Planet


 * The eyes of the actors playing the Cybermen can be clearly seen through the eye holes.
 * The Cybermen were like us, they are just in their cybernetic early stages.


 * As with other early Doctor Who serials set in "the future", technology and human advancement displayed in this episode, set in 1986, does not coincide with real-world development by that time, even as shown in contemporary stories such as Attack of the Cybermen, and certainly not in later revival series episodes.
 * However, there is repeated precedent involving UNIT, Torchwood Institute, etc. to suggest that the general public was not always aware of the level of technology available on "current-day" earth.


 * A Mondas Day appears to only be a few Earth seconds.
 * Why shouldn't it be? This could be the result of whatever cosmic force caused it to be pulled out of our solar system all those years ago, and now ultimately returned to it.
 * But the spin speed shown would instantly destroy any Earth-like planet, as the centrifugal force would exceed its gravitational pull.
 * Presumably, the view of Mondas shown was intended to be deliberately speeded up by the Snowcap systems, perhaps to show more clearly the way it was moving''.


 * Sometimes the Cybermen start to talk before their mouths open.
 * They're cyborgs, and their voices don't sound like anything conceivably produced by human, or even any kind of animal vocal chords. It's possible the mouths open and close independent of speech, kind of like a Teddy Ruxpin.


 * In episode one when one of the Cybermen is shot his 'ears' flap about.
 * Why shouldn't they? If he still has his human ears and he has been injured, they may well come loose.


 * The script requires the Cybermen to pass for human in their parkas, an effect ruined by the lamps on their heads.
 * Given the weather conditions, they pass well enough.


 * Barclay says that he designed some of the base, and that he couldn't fit into the ventilation shaft, but it is broad enough to accommodate Geoff Capes.
 * It is possible that an unseen portion of the shaft was narrower than that which is shown.


 * How can Earth and Mondas have identically shaped land masses, as each planet has been separately affected by continental drift for millions of years? ::Does anyone explicitly state that the continents have moved differently from each other?''


 * It is always seen snowing in Antarctica. In fact, due to its high altitude, the Antarctic air is very dry and precipitation is rare.
 * Although precipitation is relatively rare in Antarctica, it does vary significantly depending upon where in Antarctica you are. It is also not unusual to have white-out conditions, which can resemble snowing.


 * The Cybermen's helmets were held together with Sellotape, which can clearly be seen in this episode.
 * These are a very primitive version of Cybermen.


 * Obviously, the writers haven't decided yet how many hearts the Doctor has. Polly checks his pulse and finds it normal.
 * It's normal for him, or normal enough so far as Polly knows. She's a secretary, not a doctor, and would not be expected to deduce from his pulse that he might have two hearts.


 * When the Cybermen are ambushed outside, one of them has part of his headpiece(one of the "jug handles") come loose.
 * He has just been shot with a powerful energy weapon that would likely cause all kinds of such damage.


 * The dialogue between Cutler and the technician at the beginning of Episode 3 is slightly different from that which closed Episode 2.


 * How did the Doctor know about General Cutler's plan to launch the Z-bomb? Cutler decides to do this in Episode 3 but the Doctor was lying down ill in another room throughout the episode – but he walks into the Tracking Room and says "Your plan is foiled sir!"
 * He obviously overheard the plan while laying there. Also, throughout this story, the Doctor is shown to have some information about what is going on - particularly, the fact that the Cybermen will appear. Presumably he gets this from the same source as his inforrmation about the Aztecs, the French Revolution etc - ie. from history files. The Z-Bomb plan could have been mentioned in those same sources. It would be an important element in Earth's history - especially if, without the Doctor, Ben and Polly's intervention, it was detonated.''


 * In part 4, Ben refers to Mondas as "Mandos".
 * Simply a variation in inflection, while he's pronouncing an alien word he's never heard before this story.