The Eleven

The Eleven was an infamous Time Lord criminal. He went insane after his personality fractured into a torrential conglomeration of his past and present incarnations constantly fighting and arguing with each other in his head for dominant control. Following this, he would continue accumulating more personalities as he regenerated, giving rise to his current epithet in his eleventh incarnation.

Biography
In his first incarnation, the Eleven worked in the Panopticon Archive, where he found information about a prototype of a stellar manipulator. (AUDIO: The Satanic Mill) He also had a seat on the High Council.

During his eighth incarnation, the Eleven developed personality defects which allowed his other incarnations to live on inside his mind. The Eleven turned to criminal activity after this.

The Eleven was captured by the Seventh Doctor and imprisoned on Gallifrey.

When he escaped, he managed to steal a TARDIS. The Eighth Doctor was brought in to find him. He installed himself as President by an ancient edict as he created a state of emergency and the President was off-world. He used the Sash of Rassilon to freeze the Time Lords. (AUDIO: The Eleven)

The Eleven hired Fortuna and Cleaver to bring the Doctor to him. (AUDIO: The Galileo Trap)

The Eleven found the prototype stellar manipulator and planned to use the death of a Time Lord to activate it and destroy the Sol system. He captured the Doctor for these means. The Eleven's plans were prevented by an unknown force, and the Doctor's screwdriver signalled for the TARDIS to land near the Doctor, allowing him to escape. (AUDIO: The Satanic Mill)