The Third series follows Edmund BlackAdder, butler to the Prince Regent, George, and his dogsbody, Baldrick.  They dabble in Politics, the aristocracy and the French Revolution, Marriage, and Literacy.  A more light, easy-going series, with a great performance by Hugh Laurie as the thick Prince George.
  In the first episode, "Dish and Dishonesty", Pitt the Younger is appointed Prime Minister, and decides to try and get rid of George.  BlackAdder buys the Rotten-Borough of "Dunny-On-The-Wold" and elects Baldrick as candidate.  This way, they can tip the even numbers in favour of the Prince.  If only things were that simple!  This episode is sometimes used in schools to give an entertaining look at politics in the 17th century.
  So, what about the ending?  George has made love to the neice of General Wellington, who has sworn to kill any man who makes love to a member of his family.  Bad news, eh?  BlackAdder is asked to take the place of George.  He does, and then meets Wellington.  When the time of the battle comes, BlackAdder plans to get his cousin, McAdder, who is also in town at the time, to take his place. This doesn't happen. 
  As a gift, Wellington had given BlackAdder, pretending to be the Prince, and cigar case.  At the battle, which turns out to be with cannons, and not swords as BlackAdder had thought, he is shot.  Luckily, it hits the case, and he survives.  Then, George, posing as the butler (BlackAdder) comes in and claims that he is the Prince.  Wellington is disgusted that the butler could tell such a stupid lie, and shoots him.
  George's mad father turns up, and BlackAdder keeps up the pretence that he is George.  The viewer is left to assume that he is made king.
  Click here for some great BlackAdder the Third quotes.