Intern (The Hand of Fear)

An intern was a medical doctor at the British hospital into which Sarah Jane was admitted after she sustained injuries at a nearby quarry. He was likely Sarah Jane's attending physician.

He also performed a cursory examination of the Fourth Doctor, but did not discover that the Doctor had a binary vascular system. Instead, his superficial observation merely revealed that the Doctor had a pain in his right forearm before the Doctor abruptly ended the examination. When the Doctor asked intelligent questions about Sarah Jane's condition, the intern asked where the Doctor had completed his medical training. When the Doctor answered, "Gallifrey", the intern assumed that it was a place in Ireland.

Dr Carter, whom the intern knew at least by name, worked at the same hospital's pathology laboratory. (TV: The Hand of Fear)