The AI-drone C.A.R.L. (Completely Automated Researcher of Life) is sent on a mission to discover how microbes, the tiniest life forms on Earth, can help secure a sustainable future on our planet. Together with his ally C.A.R.L.A., who has Advanced microscopy features, they go on a journey through the natural environment of plants, animals and the atmosphere. They discover that microbes help plants and animals grow and that they provide clean drinking water as well as the air we breathe. Using their unique zooming superpowers, they show us the wonder and beauty of the world of the smallest living creatures.