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Rastel was a Sontaran. He didn't like being put on patrol, and wanted to fight the Rutan Host. He noted an intrusion in their space, a Dalek spaceship. In the new timeline, he came under Dalek control, and supervised the workforce in Moscow. He asked Mary Carter to look after the Eighth Doctor. He trusted Mary with his weapon. He was later exterminated by a Dalek on the Master orders. (AUDIO: Master of the Daleks)