New Earth

"New Earth" is the first episode of the second series of the British science fiction television series Doctor Who, first broadcast on 15 April 2006. It is a sequel to the first series episode "The End of the World", and brings back its villain who was thought to be destroyed, Lady Cassandra, as well as the mysterious Face of Boe. Set in the year five billion and twenty-three after the destruction of Earth in "The End of the World", the Doctor and Rose arrive on the New Earth and enter a hospital run by half-alien cat-like nuns called the Sisters of Plenitude, who have been hiding a gruesome secret.