I was a bit surprised that he could actuallyget to Skaro, to be honest. I assumed that it was stuck in the Time War?
The PC Adventure games are considered to be fully in cannon by the BBC and were explicitly said to be so at the time. "Should be considered four additional episodes of the series..." I believe was the exact quote at the time, while Moffat was showrunner.
And one of them is set on
Skaro...