Kane

Exiled from his home world for his crimes as a vicious mercenary, Kane was imprisoned on the dark side of Svartos, where the promise of the key to his release being hidden nearby was enough to keep him searching. For thousands of years he waited until the key was found. However, when it was, the Doctor discovered that his home planet was gone, destroyed when its sun went nova. Denied of the revenge that had been the point of his existence, Kane opened the shutters of his control room. This briefly let the sunlight in, which melted him.

Kane was only in Dragonfire.