[thaddeus6th]

Not sure whether this warrants spoiler warnings, given what I've already put and that it's canon status is dubious at best, but the following may contain spoilers for the Doctor's identity:




When Pythia, the cult priestess who used to rule Gallifrey, was overthrown she cursed the Time Lords so they became infertile. A triumvirate (Rassilon, a la the Five Doctors, Omega and the Other (name lost to time)) overthrew her. Omega was thought to be killed in creating the black hole that is the source of Timelord power, and Rassilon became a dictator. The Other knew his days were numbered and threw himself into a genetic loom. Eventually, it is surmised, his genetic parts were reweaved into the Doctor, and the Other's daughter, Susan, recognised him as 'grandfather'.

Simple.

Ahem.