This episode was first broadcast on June 4, 2005. It was written by Russel T Davies and directed by Joe Ahearne. The showrunner was Russell T Davies.
The Doctor visits Cardiff and meets an old enemy.
This unexpected sequel to 'Aliens of London / World War III' has a surprising number of things going for it:
The episode also lays some groundwork for the rest of the series and for the spinoff series Torchwood by:
Excellent fun.