3. Humor
Its essential for any program to have some humor and Doctor Who has it just right, balancing out the action and occasional darkness of the show. Even in the more serious episodes, you manage to have a little laugh. In the middle of the Dalek Parliament, when a signal comes through with music and someone asks what it is, the Doctor respond 'Its me playing the Triangle'. Surly you smiled seeing the Doctor do all those jobs in an hour. How can you, when getting a drink, resist saying 'Tea, the strong stuff......Leave the bag in'. It makes watching so enjoyable. There are many other wonderful parts I could point out, which to me shows they were funny enough for me to remember and that's always a good thing.