The hospital is staffed by adult animals with mainly young animals as patients. Regular characters include: • Dr. Matthews – A dog who seeks the romantic attention of Surgeon Sally. • Nurse Kitty – A cat who seeks the romantic attention of Dr. Matthews, who, for the most part, appears not to notice. • Surgeon Sally – A hippo who is a workaholic surgeon and has no time for Dr Matthews' attention. • Clare and Arthur – Two rats who provide technical and laboratory services. • Dr Atticus – A tortoise who is the anesthetist and often falls asleep. • The Two Teds – Two identical twin bears who drive the hospital ambulance and work as orderlies. The English-language version featured the voices of
Kevin Whately (Dr. Matthews),
Sally Ann Marsh (Nurse Kitty),
Celia Imrie (Surgeon Sally),
Paul Shane (The Two Teds),
Brian Murphy (Dr. Atticus), Julie Higginson (Clare the lab rat) and
Jonathan Kydd (Arthur the Lab Rat). Guest voices included
Dame Thora Hird as Gracey Greyshell in ''Gracey Greyshell's Last Day''. ==Episodes==