S7E10 - JOURNEY TO THE CENTRE OF THE TARDIS
THE DOCTOR FORCES ANDROIDS TO LOOK ALL ROUND THE TARDIS FOR CLARA.  WITH SWIMMING POOLS, GARAGES, LIBRARIES AND MUCH, MUCH MORE, THE DOCTOR MUST FIND HIS FRIEND AMONG THE HUGE CORRIDORS OF THE TARDIS BEFORE HIS SHIP EXPLODES!  BUT WHILST LOST IN THE TARDIS, CLARA FINDS A BOOK THAT CONTAINS A DARK SECRET: THE DOCTOR'S NAME.