2. Cassandra
Cassandra featured in two episodes of the new series. Firstly in The End of the World in Series One and then in New Earth which started Series Two. Her return can be linked to the performance of Zoë Wanamaker, and that there was a story to be told with who is canonically the last human survivor of the planet Earth . Few people would probably argue that Cassandras return was demanded as a result of how formidable an enemy she looked when face to face with the Doctor. In science fiction it is possible to justify almost anything. People flying, teleportation, things being smaller on the outside... but Cassandra is just plain silly. How can it be logically explained that in the far distant future, after millennia upon millennia of years of technological and medical advancement that the monstrosity that is Cassandra could ever come about? Even if you accept that the only way to keep someone alive way to stretch them like a canvas in a door frame, you have to question why the only way they can be kept alive is by being constantly moistened with a Poundland garden sprayer. What kind of crummy life support system is that? Surely the metal frame she was stretched between could have doubled up as a sprinkler system so she could self lubricate. Cassandra however doesnt earn her spot on the list by not seeming as formidable as the weapon clad Dalek or the silent assassins that are the Weeping Angels, but rather for being the worst Christmas present any child could ever hope to unwrap. Yes, someone, somewhere decided that it was a good idea to release an action figure of Cassandra after she dies. The figure is advertised as Destroyed Cassandra and consists of an empty plastic frame that does nothing. Remember that scene from the movie Big where Tom Hanks laments that playing with a Transformer that turns into a building is boring because a building doesnt do anything? Well the Destroyed Cassandra figure is much worse for being an empty space that does nothing.