The Doctor enters the tunnels .
The Doctor confronts the Wirrrn Queen , who has made her nest around the planet 's artificial power source ; he is able to rewire it and electrocute her , but some of the Wirrrn larvae survive .
The Doctor enters the tunnels and confronts the Wirrrn Queen , who has made her nest around the planet 's artificial power source ; he is able to rewire it and electrocute her , but some of the Wirrrn larvae survive .