Is there "life" out there? Do UFOs and "extra-terrestrials" really exist? What would it be like to live in space? The Doctor and his companions find the answers to these and many extraordinary questions as they travel in the TARDIS through time and space. Explore the mysteries of the universe yourself — in this exciting quiz book there are tricks and puzzles galore for you to try your hand at! Michael Holt, author of the Doctor Who Quiz Books, has written well over 100 books, mostly for children. He has also appeared on his own Mathemagical show on BBC Television.