Dalek
"You would make a good Dalek".
Wow! This was, in so many respects, the best episode so far. For the first time that I can remember, we have a Dalek that actually has some depth, and could seriously be taken as a threat. The interplay between the Doctor and the Dalek was superb, with some great one-liners, and Christopher was on top form; he really managed to convey the anger, hate, remorse, guilt and loneliness of a man who is the last of his race. Incidentally, this is the second story not to be written by RTD, both of which are demonstratively the best yet.
In the opening scene, there is a great shot of an alien facehugger egg in the background, a mechanoid and seeing the cyberman again was nostalgic, not only for us but for the doctor as well.
The first scene with the Doctor and the Dalek alone in the cage is a classic; so many gems here. The anger of the Doctor is real as well as the guilt. He implies he carries the burden of destroying the entire Dalek race as well as the Time-Lords, they share the fact that they are both alone in the universe. There is a nice parallel here with 'Genesis'; Tom Baker's Doctor agonised over the decision to end the Dalek race, but here we see a vengeful Doctor who does not give it a second thought.
On the downside, the beauty and the beast sub-plot with Rose and the Dalek was predictable and tedious, but their first scene was useful in that it showed the physiological manipulation the Dalek is capable of, was unexpected, and it was also interesting that the Dalek can regenerate using the DNA of a time traveller. The Dalek killing the guards, showed for the first time, it is a force to be reckoned with; the forcefield was an inspired innovation, though the levitation did not have the same punch, as its been seen before.
The Dalek killing using the combination of the sprinklers and gun showed its intelligence and ruthlessness, but its desperation evident when asking the Doctor what to do. Nick Briggs deserves special mention for his performance as the Dalek, particularly the scene with Rose in the lift. I loved the Dalek armour opening to reveal the Kaled mutant, as well as the admission that both the Dalek and Doctor have changed. Christopher's performance here is his best yet; the Doctor carries the guilt of not being able to save his people (and possibly the Daleks?). I will admit that I did actually feel sad and sorry for the Dalek as it self-destructed; great writing. My only real quibble is that with the limitations of the 45 minute one episode format, the secondary characters are never able to develop, so you never feel any great empathy with them. Overall though, a classic episode.