'In all my travelling's throughout the universe I have battled against evil, against power-mad conspirators. I should have stayed here. The oldest civilization, decadent, degenerate and rotten to the core. Ha! Power-mad conspirators, Daleks, Sontarans, Cybermen, they're still in the nursery compared to us. Ten million years of absolute power, that's what it takes to be really corrupt.' 

The Sixth Doctor - 'Doctor Who - Trial Of The Time Lord part 13 ' (1986)