Dr Lomax worked in the pathology laboratory Ashbridge Cottage Hospital.
He was not amused when Dr Henderson sent him a blood sample that was not human. Thinking it a prank and a waste of his time, Dr Lomax paged Dr Henderson who rung him back whilst en route to radiology to find the culprit behind what Henderson similarly thought was a prank: two hearts appearing on the chest X-ray film of his new patient. Dr Henderson assured a sceptical Dr Lomax that he drew the blood himself from an adult male patient and that it was his responsibility to care for him, whether that made him a doctor or a veterinarian. (TV: Spearhead from Space)