When the Doctor surprises her one day, Savannah ends up going on one BIG adventure with him- to another planet, of course! When they arrive, they notice the people, trapped in the glass that serves as the ground. Savannah and the Doctor must climb a tower, each floor filled with a new fright, to reach the bell and set this species free. But when the tower begins to crumble, things take a turn for the worse...

Travelling with the Doctor? Need some help? Well here it is! Welcome to The Comprehensive Book of Rules for Time Travelling Companions, for those of you who follow in our footsteps.