The world of Doctor Who obviously revolves around the eponymous main character, but what does it take to save the universe over, and over, and over? How hard is that job really, and in the end, would you want it? That is the ultimate question we have had over our series, and one we answer in this episode. To come to a proper conclusion, we have to look at all of the advantages The Doctor has at his disposal that tip the scales in his favor. We already looked at the TARDIS, so here we turn our attention to his array of gadgets, including his sonic screwdriver, his psychic paper, and his strange alien biology. Does having two hearts help, or hinder? What is triple helix DNA anyway? All that and more will be discussed in this thrilling conclusion!