Blackadder's Christmas Carol aired on BBC on December 23rd 1988.
Set between Blackadder the Third and Blackadder Goes Forth, Blackadder's Christmas Carol features Ebeneezer Blackadder, the kindest man in England. His moustache shop in Dumpling Lane never turns a profit because he gives away everything to charity. Baldrick, his faithful friend and servant sees him as the victim, as people are taking advantage of his kindness.
On Christmas Eve night, Ebeneezer is visited by the Spirit of Christmas who congratulates him for his work. However, the Spirit shows him what his ancestors were like, namely Lord Edmund Blackadder and Mr. E Blackadder Esq, who lie, cheat and steal their way to get what they want, namely Lord Blackadder using his cracker gift of a novelty death warrant on Lord Melchett. Also Mr. E Blackadder giving away the Prince Regent's presents to an old woman, then chasing hr through the dimly lit streets to get them back.
Instead of being repulsed by the idea of how they acted, Ebeneezer is admired by their wit and evil natures. He sees his future if he became evil like his ancestors and he finds that he'd be ruler of the universe and married to Queen Asphyxia. If he chooses to remain good, then the future is much the same, but instead, his descendant is Baldrick's slave, who is completely incompetent and wipes out the Galactic Empire's fleet in a single battle.
Realising that the bad guys get all the fun, he wakes up on Christmas morning a changed man. His first act is to punch Baldrick in the face repeatedly, then push an urchin off his window ledge. After getting dressed, he opens the door on some fat orphans singing. He steals their pudding and goes back inside. After getting rid of Mrs. Scratchit and her annoying goddaughter Millicent, he settles down. However, Victoria and Albert knock on the door and give Baldrick their royal seal and tell him that Blackadder is to receive £50,000 and the title of Baron for his good work to charity. However, before Baldrick can tell him, Blackadder insults them and drives them off. As Blackadder settles down to eat his Christmas dinner, Baldrick tells him they were the REAL Queen and Prince and shows him the royal seal as evidence as Blackadder looks shocked.