You may be looking for Osric (A Fairytale Life).

Professor Osric was a scientist in charge of Mariah Learman's time travel experiments. He used Heisenberg's uncertainty principle in relation to time — that the act of using a clock to measure time changed time — and orthopositronium-coated mirrors to achieve time travel. This set-up worked first after the effects of the Daleks' Temporal Extinction Device, then in the presence of a source of chronons. He was killed by the Daleks. (AUDIO: The Time of the Daleks)

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