Dr. Cadoc is a Scottish doctor who lives in Cynwrig in Wales.
In 1905, Dr. Cadoc informed Bertram, Gwydion and Huxley Billingsworth of the death of their controller, Ellis Garth. He revealed it was a pulmonary embolism, a blood clot in the lung, that killed him.
Cadoc appeared to be quite sincere and sentimental, finishing what Huxley was saying when he broke down.
- Cadoc is the only character in the series to have a Scottish accent.