Marc Brunel was a scientist from Earth.

In the 1820s, he was expected in a scientific meeting in Killingworth sponsored by Lord Ravensworth and hosting George Stephenson, among the others. The meeting was supposedly cancelled after the plots of the Rani and the Master, thwarted by the Sixth Doctor. (TV: The Mark of the Rani)

The Sixth Doctor read his name in a collection of business cards of geniuses to consult for a problem of time slip. (TV: The Two Doctors)

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