It'd be surprising if more Daleks turned up. Theoretically, the Doctor has killed the entire Dalek nation about 4 times.
1. The First Doctor thought he had destroyed all the daleks after their city on Skaro blew up, the very first time he encountered them.
2. The Second or maybe Third Doctor thought the Daleks were finished when he caused a number of them to be injected with the so-called "human element". He proclaimed their end during the civil war that erupted.
3. The Seventh Doctor thought the Daleks were finished at the end of Remembrance of the Daleks (broadcast in 1988). He fooled Davros into activating the Hand of Omega (the Time Lord's prototype remote stellar manipulator - the device used by them to create singularities, the power source of their time travel machines) and the Hand blew up the Sun around which Skaro orbited and thus destroyed the entire system in which Skaro is based, something like 1,000 years PRIOR to the creation of the Daleks. The Seventh Doctor again proclaimed the Daleks destroyed, although Davros was seen escaping the destruction of the Imperial Dalek mothership at the end of the final episode of the serial.
4. The Ninth Doctor claimed last Saturday that he'd destroyed the entire Dalek species in the so-called Timewar, whatever the hell that is.
And thats not even counting the near misses, such as the Fourth Doctor almost choosing to blow up all the Dalek labs in Genesis of the Daleks.
What I suppose all this shows is that the pesky creatures are amazing survivors.
Philip
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