The White Guardian: Greetings, Doctor! You:Hello, and who are you? The White Guardian: I am the White Guardian, and I have brought you here for a special purpose. You: What is this purpose you speak of? The White Guardian: I need you to find the Key to Time for me. What do you say? You: Yes.. I'll do it. The White Guardian: Very good. You will find everything you need inside your TARDIS.