"You existed, without my permission. I have destroyed many for that crime, and I shall destroy all of you as well."
And then there were two.
Two Doctors, identical in every way, even thinking alike. But soon, one of them will become the omnipotent Zalaxal, an evil from the dawn of time, a force bent on universal destruction... but which is which?
In his blundering, the Doctor has unleashed upon the Universe a criminal imprisoned by his own race millennia ago... a force that will soon by a quirk of fate find its way to Gallifrey itself. And what better place to begin the destruction of all existance than the planet of the Time Lords?
Faced with a crisis so severe that even the Master lends a hand, can Ace and the Doctors defeat the cunning plans of Zalaxal, or will the Eighth Doctor's love of opera remain but a pipedream?