Omega (Doctor Who)

Omega was the Time lord who gave his people the ability to travel in time. Using a remote stellar manipulator, The hand of Omega, he blew up a star. Legend says that Omega was lost in the explosion, but in fact he was sucked into a resulting black hole, where he continued to exist in an antimatter world he controlled using the forces contained in the black hole. He was unable to escape as his will held this world together. He felt that he'd been abandoned by the Tme Lords and eventually sought revenge by draining all their Power.

The three doctors
With their power over time being drained away through a mysterious black hole, the Time Lords send he first two incarnations of the Doctor to help the third investigate. The first Doctor is trapped in a "Time eddy", able only to advise, but the Second and third doctors travel through the black hole and battle renegade Time Lord, Omega in a world of anti matter. Omega wants the Doctor to take his place so he can escape from his world. But the Doctors discover that only Omega's will lives on and he cannot leave. Using the Second Doctor's recorder, which has not been conerted to antimatter, the Doctors destroy Omega and his world-granting him the only freedom he could ever have.

Arc of Infinity
Omega has somehow managed to survive. In further attempt to escape, Omega plans to "bond" with a Time Lord and assume his form in the real universe. To achieve this, he needs the bio-data of a specific Time Lord-the Doctor. To prevent Omega's escape, the Time Lords try to execute the Doctor, but he escapes and unmasks the traitor in the high council of Time Lords who has been helping Omega. The doctor travels to Amsterdam. where he confronts Omega- who is now in the Doctor's form. But the transition is unstable, and Omega's body is deteriorating. Despite feeling sympathy for his old adversary's predicament, the Doctor and his friends are able to finally defeat Omega.