Malador

According to legend, Malador was an immortal and indestructible being of pure evil. He was the creator of the Melkur.

Wanting to exist without guilt, Malador had his conscience surgically removed. He was imprisoned in a stasis field on Serenity. Millenia later, he was accidentally revived by Auga's attempts to deactivate Prophecy. The Sixth Doctor modified Prophecy's power source to amplify the energy in his tomb. This caused a dimensional fracture through which Malador and the Melkur he had summoned were pulled, removing them from this universe. (AUDIO: The Guardians of Prophecy)