Back in 1984, Doctor Who foresaw Twitter. No, seriously.
Without a doubt the highlight of the Colin Baker era, Vengeance on Varos is a wonderful critique on the way media and individuals treat political officials. When the TARDIS runs short of a mineral vital to its function (more on this later) the Doctor and Peri are forced to travel to the planet Varos to procure the mineral, Zeiton-7. A supposedly improvrised planet, the planet is governed by an elite who are content to keep the planet enslaved, in exchange for selling the mineral at a marked down price to the Galatron Mining Corporation, led by the insidious Mentor, Sil. The figurehead of this elite is the Governor, a man who in reality has little power because all inhabitants are required to vote on his performance, and the penalty for his inevitable failure to meet their demands is potentially lethal Human Cell Disintegration Bombardment.