Dalek X

Dalek X, also known as the Dalek Inquisitor General, was one of the most sacred and feared Daleks before the Last Great Time War. He was described as having a gunmetal black casing with gold vertical slats and sensedomes.

Biography
Dalek X's name was told across the universe and it was every bounty hunter's fear to encounter him, they often refer to him as "the Devil in Dalek form". However he is it is also known that it is, every bounty hunter's dream to defeat him. He lasted until just before the Time War when it met the Doctor. After enslaving the Doctor and a team of bounty hunters, he thought himself victorious over the Time Lord, he subjected the Doctor to different methods of torture, simply to see how much pain he could suffer. However in the end his methods proved unsuccessful,as the Doctor resisted them all. He eventually allowed the Doctor to take him back to the planet Hurala, where the Doctor led Dalek X into a room about to explode, then escaped in his TARDIS, taking the surviving bounty hunters with him.

Dalek X was thought to die in that room, although later the Doctor recognised his radio waves broadcasting across the universe for help and so homed in on him. The Doctor finished what he had started, leaving Dalek X to suffer forever in the darkness, living off of life support systems, never being able to find help as the planet's systems stopped fellow Daleks from receiving the beacon. He did however promise to come back and get his revenge on the Doctor, who promised to be waiting for him. (NSA: Prisoner of the Daleks)

Dalek Inquisitor General