Sam is at the fair with his mum and grandmother, when suddenly his gran becomes unwell and is taken to the hospital in an ambulance. This is the first time Sam hears that she has lung cancer. Sam doesnt understand what this is and is clearly anxious. The Medikidz come to the rescueand whisk him off on an exciting adventureon Mediland,where he gets to find out all about the lungs and lung cancer. At the end, he heads back to see his gran in hospital, and feels much less anxious, armed with his new knowledge!