the neutron flow", but this action allows Borusa and the Fifth Doctor to arrive via transmat. Borusa uses the Coronet to prevent the Doctors' companions from interfering while he speaks to Rassilon. An image of Rassilon appears above the tomb and offers Borusa his ring as the key to immortality. The other Doctors try to stop Borusa, but the First Doctor tells them to hold off. Borusa dons the Ring, but then shortly disappears, becoming living stone that is part of Rassilon's tomb. The First Doctor realised what fate the tomb's writing foretold: immortality, but at a cost of perpetual incarceration. Rassilon frees the Fourth Doctor and Romana from the time vortex and returns the Master to his own time; the Doctors immediately refuse his offer for immortality. The First, Second and Third Doctors collect their respective companions and return to their time streams as well, leaving the Fifth Doctor with Tegan and Turlough. Chancellor Flavia arrives via transmat, with the Chancellery Guard, and, after learning of Borusa's fate, declares that the Doctor is now Lord President, a position he cannot refuse. The Doctor tells Flavia to return to the Citadel as he will follow shortly, then quickly departs with his companions, as he has no intention of returning to Gallifrey any time soon. Tegan asks if he's planning to jet off across the galaxy in an old spaceship running from his people. With a grin, he replies that of course he is, as that's how his adventure started in the first place. Production The working title for this story was The Six Doctors. It would have been written by former script editor Robert Holmes and would have featured the Cybermen and their kidnapping of the five incarnations of the Doctor; in their attempt to extract Time Lord DNA to turn themselves into "Cyberlords", the twist being that the First Doctor and Susan would actually be android impostors (the former being the "Sixth Doctor" of the title) and the Second Doctor would have saved the day. However, Holmes dropped out at an early stage and another former script editor, Terrance Dicks, was brought in instead. Some elements of this plotline would be reused in Holmes' own The Two Doctors (1985) and in Chris Chibnall's "The Timeless Children" (2020). The programme is officially a co-production with the Australian Broadcasting Corporation, although the production team were not aware of this during production