is a 1982 adventure television series set in Edwardian England, starring Sam Waterston as Professor Quentin Everett Deverill.

[1][2] The Professor was a scientific detective in the mold of Sherlock Holmes, and the series had a smattering of what would later be called steampunk.

In the show, the lead character was known primarily by his initials, Q.E.D; the reference here is that Q.E.D.

usually stands for quod erat demonstrandum, a statement signalling the end of a proof.However, characters would sometimes state the initials to represent "quite easily done".

This article relating to a drama television series in the United States is a stub.