"Do you wanna come with me? 'Cause if you do then I should warn you, you're gonna see all sorts of things. Ghosts from the past. Aliens from the future. The day the Earth died in a ball of flame. It won't be quiet. It won't be safe, and it won't be calm. But I'll tell you what it will be: the trip of a lifetime!"
- The Doctor, Series 1, Trailer 5 (2005)