And when you think about it, it's never really been explained how the Daleks survived their supposed destruction at the end of their debut story. I think later shows argued that their subsequent appearances all occurred before The Daleks, but then Planet of the Daleks had the Third Doctor refer to himself, Barbara, Ian and Susan helping the Thals fight the Daleks on Skaro.
And when did the Daleks abandon Skaro? Planet of the Daleks implied that the Thals were the inhabitants of the planet by the 26th century AD, and it had been abandoned for quite some time in Destiny of the Daleks.
And when did the Daleks abandon Skaro? Planet of the Daleks implied that the Thals were the inhabitants of the planet by the 26th century AD, and it had been abandoned for quite some time in Destiny of the Daleks.