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Markus Schriver was a human scientist who worked for the Ides Scientific Institute. He experimented to create a psychic link between astronauts and their ships. His experiments formed the basis of the creature that became the Eminence. The Eighth Doctor compared him to Mikhail Kalashnikov. Liv Chenka thought he was mad and that he was on the verge of a mental breakdown. He then murdered Sally Armstrong by the process of random selection between Sally and Liv. (AUDIO: Masterplan)

The Dalek Time Controller tracked him to the Eye of Orion. The Time Controller observed his final experiments. He recognised Liv when she arrived with the Time Controller. Schriver transferred his consciousness into the gas he created, and thus became the Eminence itself. (AUDIO: Eye of Darkness)