At Blackadder Hall in 1999,
Lord Blackadder (
Rowan Atkinson) is entertaining four guests on
New Year's Eve. He informs them he has built a
time machine using plans drawn by
Leonardo da Vinci and wagers £10,000 each that he can bring back any item from history they request.
Archbishop Melchett (
Stephen Fry),
Archdeacon Kevin Darling (
Tim McInnerny),
Major George (
Hugh Laurie), and
Lady Elizabeth (
Miranda Richardson) agree to this and challenge him to bring back a Roman
centurion's helmet,
wellingtons worn by the
Duke of Wellington on the day of the
Battle of Waterloo, and an ancient pair of 200-year-old underpants. The whole voyage is actually a scam, as Blackadder has, in fact, had
Baldrick (
Tony Robinson) retrieve the items from his storage, and the time machine is a prop. Blackadder stages the time machine travelling through time for his guests, with himself and Baldrick hiding inside, but when he opens the door, he finds it has actually worked. They are now in the
Cretaceous period, where they are confronted by a
Tyrannosaurus. They throw away their wager items but are eventually able to defeat it using the underpants. Baldrick admits that, as he never got round to writing the dates on the dials, they cannot return to the present. Blackadder and Baldrick return to Blackadder Hall but during the reign of Queen
Elizabeth I (Miranda Richardson) who, mistaking him for his ancestor, orders his beheading unless he has a present for her. While rummaging through his pockets, Blackadder drops some
Polo mints onto the floor, which he then offers to the Queen. She loves them, rewards him with her crown and orders him to go forth and bring back lots more "minty things". On his way back to the time machine, Blackadder meets
William Shakespeare (
Colin Firth). He gets his autograph before hitting him saying "that is for every schoolboy and schoolgirl for the next four hundred years" and leaves. Blackadder tries to remember how the dials were set. They eventually land in
Sherwood Forest and are captured by
Robin Hood (
Rik Mayall). Blackadder asks the
Merry Men why they steal from the rich, facing certain death if caught, live in the forest with no toilet facilities, and yet give all they steal to the poor who, must accordingly view it as a reason not to work. Realizing Blackadder is right, the outraged Merry Men
shoot Robin. After first having sex with
Maid Marian (
Kate Moss), Blackadder leaves, taking Robin's hat as a souvenir. Next, the time machine lands upon the Duke of Wellington (just before he announces his plan to defeat Napoleon's forces) at the Battle of Waterloo in the process. Blackadder steps out to steal the Duke's boots, feeling he may as well try to win his wager. This is followed by them landing at
Hadrian's Wall in
Roman Britain, where they spy their Roman ancestors. After stealing a helmet, Blackadder and Baldrick escape from a charging group of
Picts. Baldrick mentions that
dying people have their lives flash before them and that, if Blackadder was about to drown, he might see how the dials were originally set. Blackadder agrees with this and shoves Baldrick's head into the time machine toilet. The plan succeeds, and Baldrick remembers how to set the dials to return home. On the way back, as they look back on their adventure, Baldrick suggests that anyone can change the world for the better, though Blackadder argues that all most people can do is make money. Returning to 1999, the party guests are impressed by what Blackadder has returned with, but due to his
interference with history, Robin Hood is unknown, Shakespeare is only known as the inventor of the
ballpoint pen (which he had left with him after punching him), and Britain has been ruled by the French since Napoleon's victory at Waterloo. Realising that he is to blame, Blackadder runs back into the time machine to, "save
Britain!" He praises Shakespeare, charms Robin Hood, and saves the Duke of Wellington. They return home to ensure that the original timeline has been restored and to collect Blackadder's winnings from his guests. He tells them to go upstairs and watch the New Year's festivities on television, assuring them he will soon return. He informs Baldrick he has a "very, very, very cunning plan", and they set off again in the time machine. The guests watch the broadcast of the
British royal family and the
prime minister arriving at the
Millennium Dome. Blackadder is shown to now be the
absolute monarch, King Edmund III, who is married to Queen Marian of Sherwood (Kate Moss), and is joined by figurehead
Prime Minister Baldrick. ==Cast==