THEY said it could never happen - but the Doctor kisses Rose in the final episode of Doctor Who.
He then morphs from actor Christopher Eccleston into David Tennant.
And not only that. He also shares an embrace with his other companion of recent weeks, Captain Jack.
The controversial scenes were revealed at a special London screening of The Parting of the Ways, the final episode to be shown tomorrow, to celebrate the extraordinary success of the BBC Wales-produced series.
Meanwhile, a third series and another Christmas special of the show were confirmed by BBC Drama Controller Jane Tranter, who also announced that, contrary to many rumours in the press, Billie Piper will definitely be returning for all 13 episodes of the second series, soon to start shooting in Cardiff and Newport.
This means that Doctor Who fans can look forward to another 28 episodes in all, including the two Christmas specials.
Series creator and executive producer Russell T Davies said enthusiasm for the series and its eight-million-a-show ratings success had been beyond his wildest dreams.
"At the outset, we were told by many people within the business that we were making an impossible programme," said Davies. "Demographic experts told us that a show designed for family viewing was unrealistic in the current TV climate. They said, 'Don't aim for that.' But we forged ahead, and we proved them wrong."
Particularly thrilling for Swansea-born Davies was the chance to create the "ultimate" vision of fleets of Daleks in this weekend's concluding episode.
"It's the kind of make-believe vision of the Daleks you imagined as a child - hordes of them flying through space - and now, with CGI (computer generated imagery), we've put that on screen," said Davies, himself responsible for writing the episode.
"The final episode is epic in every sense, and a reward to loyal viewers who have stuck with the whole series; there are references to every other episode in the series, and we pay everything off. It's the least the fans deserve!"
Davies said that the first time he and the production team all got together to watch the finished episode, they were all "gobsmacked" by its epic quality, and at the end of the screening, Julie Gardner, head of BBC Wales Drama and the programme's co-executive producer, turned to him and said, "Do you realise THAT was all made in a Newport warehouse!"
Treats in the episode include a return of the Anne Droid computer, voiced by Anne Robinson, who exterminates three Daleks after announcing to them, "You are the weakest link - goodbye!"
Piper's character Rose also undergoes a life-changing experience after looking into the "heart" of the Tardis, the Time Vortex, while the real identity of Bad Wolf is finally revealed.
But the most thrilling moment for diehard Whovians is the eagerly-anticipated regeneration scene of the Doctor, whose identity transforms from Eccleston to Tennant, last seen in the title role of BBC3 drama Casanova, also penned by Davies.
Tennant will next be seen starring in the one-hour Doctor Who special, The Christmas Invasion, for transmission in December, which Davies revealed will feature "a brand new enemy". The second series of 13 episodes start transmitting in March 2006. Future enemies include the return of the Cybermen.
"One of the hardest things about the second series will be sticking to the same road we've created," said Davies.
"In many ways, after you've proved successful with one series, the second series is the biggest, most dangerous challenge, so none of us are resting on our laurels. We want to stay faithful to the roots of the programme, while also pushing it further."
As with the first series, Davies will only script certain episodes. Already writers have been commissioned for the second series.
Davies revealed the production team had asked Harry Potter author JK Rowling to write an episode of the first series.
"But she turned us down," said Davies, "and I'm not crawling back to ask a second time!"
Davies said that having worked with Tennant will be a big advantage.
"It means I know David's rhythms of speech, his mannerisms," he said. "But, as the Doctor, he won't be hugely different to Christopher Eccleston.
"He'll have a different style of dialogue, and his own quirks - just like you had Jon Pertwee, Tom Baker and Peter Davison - but he's still the Doctor.
"He'll be wearing different clothes, but rumours that David will be wearing a kilt are completely untrue."
This series' final episode of Doctor Who is on BBC1 Wales on Saturday at 7.00pm.
DAVID TENNANT'S first words as the new Doctor Who in the final moments of this weekend's episode are, "New teeth? That's weird." Then he turns to Rose and continues a conversation Christopher Eccleston's Doctor was having with her, "Oh that's right, yes, Barcelona."
Eccleston, meanwhile, leaves the role on a self-congratulatory high. Just before his regeneration scene - and having kissed Rose - he makes his emotional farewell to her with the words, "You were fantastic. And do you know what? So was I!"