The Black Adder. What if Richard III had won the Battle of Bosworth? And then had his head cut off by some idiot.
Blackadder II. Edmund grows a brain, and quite a fetching beard.
Blackadder the Third. The dynasty continues, with E. Blackadder Esquire as the butler to the Prince of Wales.
Blackadder Goes Forth. One way or another, Captain Blackadder is determined to get out of the trenches.