5. The First Evil (Buffy The Vampire Slayer)
The First Evil relies on two things to carry out its plans: 1) Biding it's time in order to prepare and 2) Psychological warfare. However, if it was to go up against the Doctor, a battle of preparation is something it would never,
ever win. And trying to psyche out the doctor would be like trying to get blood from a stone. The First Evil is essentially an incorporeal presence without a physical body. While it is manipulating others to carry out its plans to become corporeal, it relies on fright tactics on its opponents. The Doctor, however, would simply laugh these tactics off. He would then use the preparation time taken by the First Evil to prepare a counter-plan that would foil those of the First Evil. It would, of course, be hugely entertaining watching the First Evil try to scare the Doctor, while the Doctor simply replied with witty retorts and teased it for not being able to touch anything.