The Eleven

The Eleven was the main alias used by the eleventh incarnation of a renegade Time Lord who suffered from regenerative dissonance.

Marriage
The Eleven married Miskavel and helped her destroy her own planet, for revenge against the citizens of Molaruss. The couple then went to Molaruss, when they combined Duotech neural technology with a cloning dissemination machine, so that the Eleven could put some of the other personalities into clones. They also left the Eleven's TARDIS wandering in the Vortex, controlled by the mind of the One. The Sixth Doctor and Constance Clarke found it, landed inside it and brought it to Molaruss. There, the Doctor was tricked by Miskavel into pouring the mind of one of the clones into the telepathic circuits of his TARDIS, allowing the One to take control of it and take it away, exiling the Doctor forever.

However, the detachment of his original consciousness caused the Eleven to become progressively weak to the point of death, while his clones lost all sense of control; he also discovered Miskavel took advantage of their plan to detach other of his personalities. The Eleven then accepted the help of the Eight and the Doctor (brought back to Molaruss by the One) to reverse the process and regain all of his personalities. He then proceded to escape, taking Miskavel with him, but when he tried to dematerialize while having still the Doctor's TARDIS inside his own, the latter one dematerialized in its turn. This caused a rapture in the Eleven's TARDIS, sending him and Miskavel adrift. (AUDIO: One for All)

Ruler of Molaruss
The TARDIS crashed back to Molaruss at an earlier point in time, and the Eleven and Miskavel were saved and cured by locals. Waiting for their TARDIS to recover, the Eleven joined a group of hermits who taught him how to silence the voices of his previous incarnations through meditation. After killing them all, the Eleven posed as "father Octavian", wrote a book about his experience and became a public figure, the leader of a cult. His popularity grew so much that Oliver Akkron, the president of the planet, perceived him as a threat and tried to kill him. The plan failed, though, because in all those years Miskavel disguised herself as an assistant to Akkron, and her and the Eleven killed the president. The Eleven tried to take hold of power immediately, but was instead arrested and tortured for the murder. This was all a scheme from Miskavel: using his TARDIS to go back in time once more, she made her way into the hospital he was kept and arranged for his flight, making him look as if he had been the victim of a scheme from political rivals. (AUDIO: The Murder of Oliver Akkron)

The Eleven became Global President of Molaruss, and built a "crown" that allowed him to comunicate with every single inhabitant at the same time. Eventually got bored by having to deal with two-minded beings. He convinced them then to accept his project of "elevation", and dispersed nanobites in the atmosphere: once activated, they would split the minds of Molaruss in eleven minds to make them just like him. He also schemed to inoculate a piece of his mind into their heads through the crown, so he could control them, but to avoid the potentially lethal effects of the psychic feedback, he installed a failsafe. When all was ready, the Eleven summoned the Sixth Doctor and Constance Clarke to see his triumph, and activated the nanobites. However, this last act horrifed so much Miskavel that she betrayed him, and when the Doctor persuaded the Molarussian chef of security to disable the failsafe, Miskavel stopped the Eleven from taking off the crown: to avoid death, he was then forced to reverse the process. Weakened by the effort, he was incarcerated by Miskavel into his own TARDIS, and brought far away from Molaruss. (AUDIO: Elevation)

Dark Universe and capture
The Eleven contacted Ace to use her charitable contacts to get into an isolated country and access the Dark Gate, through which he could unleash the power of the Dark Universe. There, he made contact with the Dark Citizens and used their power to become the ruler of the universe, wiping out races such as the Daleks and Sontarans and reprogramming the Cybermen to become his agents. He kept the Seventh Doctor as a jester, intending to kill him after he had given up, but was eventually tricked by him, Ace, Cardinal Ollistra and Captain Rasmus into a Matrix projection. As he was trapped there, the Doctor struck a deal with the Dark Citizens, who abandoned the Eleven and put the universe back to normal, leaving him to be captured. (AUDIO: Dark Universe)

The Eleven was taken by the Doctor to Gallifrey, where he was frozen in the Capitol prison facility. Before being frozen, he told the Doctor that it would be "child's play" to escape, hinting at his plan to escape using an eye filter. (AUDIO: The Eleven) He was unfrozen to speak to Caleera, whom he had wanted to talk to, and manipulated her into using a neural amplifier to strengthen her suppressed powers. (AUDIO: Scenes From Her Life)

The stellar manipulator
The Eleven was unfrozen on Cardinal Padrac's orders, ostensibly for an interview with Kiani. He used his eye filter to escape, breaking into the president's office and declaring himself Acting Lord President before escaping in a stolen TARDIS with the Regeneration Codex, watched by the Eighth Doctor. (AUDIO: The Eleven)

Using the Codex, the Eleven found and activated a forgotten stellar manipulator with the goal of destroying the Sun and, by extension, Mercury, Earth and Venus. Transforming the manipulator into a Victorian workhouse staffed with artificial humans, (AUDIO: The Satanic Mill) he hired Fortuna and Cleaver to capture the Doctor, in which they failed. (AUDIO: The Galileo Trap)

Regardless, the Doctor came to the manipulator and the Eleven captured him using his Orbs. He left the Doctor to die to power the manipulator, but the Doctor's TARDIS materialised around the Doctor, saving him. As it approached, the Eleven told him that his plans were far bigger than just destroying Earth for revenge. (AUDIO: The Satanic Mill)

Affairs with the Doom Coalition
The Eleven went to Syra as part of his plans with Caleera. He planned a trap in the mines to kill the Doctor. He also tried to kill Liv in the mines, but River Song stopped him. He wanted to use Caleera to destroy planets. (AUDIO: The Sonomancer) He sabotaged Livia's TARDIS before he went to the Crucible of Souls and found out that Veklin had abandoned it. (AUDIO: Songs of Love)

The Eleven later followed the Doctor and his companions to 1970s New York to track Ollistra and destroy the remaining Time Lords who were against Padrac's plans. There, he met and found out about the alliance of Ollistra and the Weeping Angels. He later manipulated the Monk and the Weeping Angels to do his bidding, helped by the Monk's desire to save his own life and used the latter to take the Time Lords who were hiding in New York as hostages. After a heated argument, he pushed Ollistra from the top of the building and fought the Doctor. Then, it was revealed that Padrac was just using the Eleven as a pawn, causing a commotion between his past incarnations. This pushed the Eleven to use his Time Ring to go back to Gallifrey and see the truth. The Doctor used this as his chance to follow him to Gallifrey. (AUDIO: The Side of the Angels)

The Eleven later found out that he could not enter the Capitol, and was found by Tessno outside the city. The latter almost killed him due to a personal grudge, but the Doctor stopped her from doing so. The Eleven was later brought in to the headquarters of the Opposition. Tessno was asked to lock him inside a room, where he provoked Tessno by using her grudge against her. Tessno released the Eleven to challenge him, but he killed her instead and escaped. He later brought Helen as a hostage and rode a Battle TARDIS to counter the plan of the Doctor to disguise as the Eleven to infiltrate Padrac's headquarters. When Caleera gave Helen the power of the Sonomancer, he was held down by Helen as the latter used the Battle TARDIS to destroy the Resonance Engine. (AUDIO: Stop the Clock)

Running from the Ravenous
The Battle TARDIS crash-landed on Rykerzon, and Helen and the Eleven were taken as prisoners. During that time, Helen cared for the Eleven and tried to help him control his condition, suppress the voices of his other incarnations. The Eleven pretended to be receptive, even calling Helen his "saviour", but it was all an act, since he wanted to use her new abilities from the Sonomancer in his plans, and link her with the psychic spider. When the Eighth Doctor and Liv arrived looking for Helen, she was thrilled to see them again, despite the Doctor being sceptical of her. Eventually, the Eleven joined with the Kandyman to take over Colony 23, a plan which was then stopped by the Doctor, Liv and Helen. He got away and became terrified of the Ravenous' arrival, something he saw whilst being linked to the psychic spider. (AUDIO: World of Damnation, Sweet Salvation)

The Eleven was able to kill Jaxa and steal her TARDIS, but the ship was somehow attacked by one of the Ravenous, forcing him to send a distress call to the Doctor. When the Doctor traced the call back to its source, the Eleven explained what was on Jaxa's ship, but subsequently stole the Doctor's TARDIS while the Doctor and Helen were trying to save the trapped Liv from the Ravenous, leaving them on Jaxa's dying TARDIS. (AUDIO: Seizure)

However, the Eleven was forced to return for the Doctor when he realised that he couldn't outrun the Ravenous on his own, (AUDIO: Deeptime Frontier) even helping to rescue Liv and Helen from the space station where they were being held captive by the Nine. (AUDIO: Companion Piece) After tracking the legends of the Ravenous to determine where they were previously defeated, (AUDIO: L.E.G.E.N.D.) the Eleven discovered that the monastery that was allegedly the place where they were trapped was actually part of a trap set by the Nine, who had learned that their regenerative dissonance made them uniquely immune to the Ravenous, as it made their regenerative energy unpalatable. However, the Eleven was disgusted with the Nine for wasting this knowledge of their immunity to the Ravenous on such a petty attack on the Doctor, forcing the Nine to retreat while he convinced the Ravenous to let him allegedly "banish" them from this dimension. Having also convinced his other selves to pretend that they had been drained away by an attack from the Ravenous, the Eleven intended to remain with the Doctor, Liv and Helen until he was ready to unleash the Ravenous on the universe once again to achieve his full revenge on his enemies in this universe. (AUDIO: The Odds Against)

Alliance with the Ravenous
Now allied with the Ravenous, the Eleven pretended to go along with the Doctor's plan to take him for medical treatment somewhere quiet. While this plan failed when the planet the Doctor took him to was revealed to be a living being that 'ate' anything on it as part of a complex life cycle, and the Eleven inadvertently revealed that his other selves still existed, he was able to affirm his alleged desire to reform by saving the Doctor, Liv and Helen from the planet. (AUDIO: Whisper)

Convincing the Doctor that he still desired peace, the Eleven requested to be taken to the desert planet Parrak, allegedly to live as a hermit. However, his true goal was to find the tomb of the ancient Gallifreyan scientist Artron, where he could retrieve Artron's Matrix print and thus his knowledge of regeneration. The plan was seemingly compromised when it was revealed that the Master, reduced to a burnt state after his failed attempts at stealing body after body, was after the same thing. The Eleven proposed an alliance which the ailing Master accepted, although he was unaware the Eleven had stolen one of his weapons and unleashed the Ravenous on him and the Doctor. Although the Doctor and the Master tried to stop him, the Eleven left the Master to be killed by the Ravenous while he retrieved the Matrix print. (AUDIO: Planet of Dust)

Returning to the Crucible of Souls, while the Ravenous fed on the Time Lord security team assigned to decommission the base, the Eleven was able to use Artron's Matrix print to reverse the polarity of the Crucible; where it would have once absorbed life energy from the dying universe, it could now grant the gift of regeneration to the entire universe, making them all potential food for the Ravenous. As the Eleven revelled in the thought of being the last being left in the universe, he was contacted by three incarnations of the Master, who offered him the still-living Artron if he would spare them from the Ravenous's current spree. The Eleven accepted the deal while planning to betray the Masters anyway, but he was unaware that Artron had inadvertently created the Ravenous, who still harboured some memory of his kindness to them before their transformation. While Liv (who had gained perpetual regeneration as she was on the Crucible when it activated) kept the Eleven's Ravenous guards occupied, the Doctor was able to help Artron realise that he could restore the Ravenous to their old state, Artron sacrificing his own life to revert the Ravenous back to the Kolstani while the Masters used the Crucible to take the ability to regenerate away from the rest of the universe. (AUDIO: Day of the Master)

Death
Attempting to escape the Crucible, the Eleven retreated to the Master's TARDIS, where he was confronted by, and. He attempted to propose an alliance between them as the Doctor's two greatest enemies, but the Masters all dismissed the idea of him as anything but "a twisted mess", and they also scorned the way he'd tried to pitch the idea of them joining together as the greatest enemies of the Doctor, a title that belonged to the Master alone. Each one of the three Masters took turns in shooting him before they kicked him out of the TARDIS. Missy left him her vortex manipulator, claiming that they weren't completely heartless. As with the Eight, the Eleven had to endure the scathing criticisms of his previous selves and their taunts. He tried to find Artron's Matrix Print to heal himself, but quickly found out the Master had already stolen it. Resigned to his fate even if he hated the thought of being pushed into the depths of his own mind like his previous selves, the Eleven was left to regenerate into the Twelve. (AUDIO: Day of the Master)

Physical description
Liv Chenka described the Eleven as tall and thin with sandy hair and remarkable cheekbones. (AUDIO: The Eleven)

Behind the scenes

 * The script of Dark Universe describes the Eleven as “Cold-as-steel gentleman, uptight and utterly ruthless”.