For decades, Holby City Hospital's emergency department has been the stage for Britain's longest-running medical drama, following the doctors, nurses, and paramedics who patch up strangers while their own lives quietly fall apart or come together. Casualty built its reputation on unflinching depictions of trauma care paired with soapy, deeply human storylines about grief, ambition, and love among colleagues who see each other at their worst. Its longevity has let it evolve alongside real shifts in the NHS and British life, making it as much a cultural institution as a drama.