The world of medicine changed dramatically with the discovery of penicillin, however, these days there are diseases, infections and superbugs resistant to antibiotics, and our own overuse of them may cause people to become immune to their benefits. In this Panorama, Fergus Walsh investigates the global advance of antibiotic-resistant superbugs, and the threat they pose to modern medicine and millions of people worldwide. He travels to India and finds restricted, life-saving antibiotics on sale without prescription, before talking to NHS patients whose recovery depends on such treatment.