Muren

 was a Time Lord commander in charge of the mission to rescue the War Ollistra and didn't feel comfortable about handing over the plans of his mission to the War Doctor. He helped the Doctor on Rovidia. After the Sontarans came after them, he thought that the local Kalan had betrayed them. He had an executive order to execute Ollistra to stop her falling into the hands of the enemy, but ultimately did not go through with it. He subsequently was shot by a Sontaran who was attempting to kill Ollistra and died. (AUDIO: The Eternity Cage)