Pit your wits against the Doctor and his assistant, Peri, in this space-age super-quiz. They are out to puzzle you with inter-planetary posers, mindbenders, brainteasers and mysteries. So switch on — and all systems go! This is the fifth Dr Who Quiz Book by Michael Holt who has written over 100 books, mostly for children. He has also appeared on his own "Mathemagical" show on BBC Television.