Theory:Doctor Who television discontinuity and plot holes/Attack of the Graske


 * If the TARDIS is following the Graske's trail, then how can it arrive before him?
 * It follows his trail to the right timezone and then has to wait around until he materialises.


 * The TARDIS is a time machine, and sometimes lands before it is supposed to when following things, such as in The Doctor's Daughter.


 * The map of Victorian London looks more like a map of modern London.


 * If the Graske wanted to conquer Earth by replacing its population then why does the Graske we see replace a modern day person and then travel back in time to replace a Victorian person? Why not just try to conquer Earth in one era rather than two eras?
 * There were less people in the Victorian era, so would be less people to replace.
 * Although following this logic why not travel back to a time before the enormous Victorian population boom?


 * How does the Doctor know that the Raxicoricofallapatorian is from the Slitheen family?
 * Different families may have different skin colours. The Slitheen are shown to be green, Blathereen to be orange and Slitheen-Blathereen to be a brown-reddish colour.
 * It is unlikely that only one family in the whole of Raxacoricofallapatorius has green skin. That is like saying only one family in the whole Earth is white or black.
 * Families on Raxicoricofallapatorius may mean the same thing as race does on Earth.
 * That is unlikely. In Boom Town, they talk about how the Slitheen are a criminal family, and they are all raised to be criminals.
 * So? Native Americans were all raised in the same way. It can be the same for Slitheen.


 * Raxicoricofallapatorians execute any member of the Slitheen family, so if the Slitheen were a race, the Raxicoricofallapatorians would be incredibly racist.
 * They were to be executed because of their crimes. It would have had nothing to do with their race.


 * The Doctor might just be able to recognize that particular Raxicoricofallapatorian as a member of the Slitheen family.


 * There is also enough evidence to suggest that Ten (and Rose) simply call any member of the Raxicoricofallapatorian race 'Slitheen' out of habit.
 * And because it's much quicker to say "Slitheen" even if less accurate.