The explosion was felt by a million worlds and witnessed by a thousand.
The Last Great Time War drew to an end. It was over. At the cost of Gallifrey, Skaro and The Eighth Doctor that is.
But there was something else. Something bad. Many worlds died in the Time War. Arcadia, the paradise world. Kolox, home to giant insects. And Polymos. And many other planets. Protein planets like Cramador.
The Nestene Consciousness used these to sustain his hunger. But they were gone. He tried in vain to find more planets for him to invade. Too bad. The individuals were either too strong or the planet was drained of minerals by a space worm.
Or it had nothing to offer. Without anything to sustain his hunger he devolved. He dissolved. Legend says he was once a squid-like life form who was a god on his mother's side. Now he's slime. Living molten plastic.
Thousands of creatures cowered at the mention of his name. Now? They laughed at him. What he had lost. What he had become. Or so he thought.
After years of searching and a bit of a warp-shunt teleportation matrix, he found it.
He found us.
He found… Earth.
But Earth has been and always will be defended. There is a creature there that millions fear. They are scared what would happen to them. He saves worlds but he destroyed them.
Legend has it he led the Time Lords into battle against the Daleks and killed them both to save the cosmos.
But that's just a legend, isn't it? What would an interplanetary dictator be scared of? The Answer? The Last of the Time Lords. The Doctor.