The Emperor

The Emperor was an incarnation of the Doctor that was the supreme ruler of the universe in the far future, as well as the biological father of Miranda Dawkins.

The Emperor was the last survivor of a great catastrophe that completely ravaged Gallifrey. For a thousand years, the Emperor reigned over the entire universe. He controlled time and space travel with a ruthless secret police force. He crushed any rebellion before it even began. The Emperor controlled the Senate of his empire through fear. He ruled from his throne on the Needle. (PROSE: Father Time)

On the night of his daughter's birth, the Emperor was assassinated by rebels. The entire empire fell into chaos overnight because the child was hidden away on Earth in the 1980s. (COMIC: Miranda)

In a vision, the Eighth Doctor and Marnal saw that one of the four surviving elementals was the Doctor with short hair, sitting on a throne and holding his newborn daughter in his arms. (PROSE: The Gallifrey Chronicles)

Behind the scenes
The Tenth Doctor's alternate timeline in Four Doctors bears a striking resemblance to the Emperor. Both feature the Doctor as the last of his kind, taking a different name, ruling over the universe as a tyrant, and even end in an assassination. Miranda's resemblance to River Song has also been noted.

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