Ethan is very close to his granddad they do everything together! But a lot has changed since his grandads stroke. His grandad cant do the things he was able to and this upsets Ethan. Fortunately, the Medikidz are on hand ready to whisk Ethan off to Mediland, a planet shaped like the human body, to explain all he needs to know about stroke. Will Ethan return from Mediland with a better understanding of stroke?