The Doc receives a psychic paper note beckoning him into a health centre run by suspicious-looking cat nuns. There he meets the Face of Boe, who is dying of old age.
Meanwhile, elsewhere in the centre, Rose stumbles across an old foe - Cassandra - who wants a new body...
As the visitation continues, things take a turn for the worse when a huge human farm harbouring all plagues of the universe is discovered. What are the cat people really up to? And will Cassandra get her wish for eternal life?
