Finnian Valentine

 was affected by the Time War and wanted to use a terrible weapon when his world was invaded. His life was rewritten by the war in two different ways, first his marriage changed from being to a woman to being with a man, and that his family was killed by the Daleks to the Time Lords. There was two versions of him when met him from both timelines. He wanted to end the Time War. The Master and Leela learnt about a power source on Arcking from him. Both versions of him were killed by the Master. (AUDIO: The Devil You Know)