As We Keep Running

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...