Hugo explores things that are 'big,' from elephants to trees, to cities and planets. But he learns that BIG can be all kinds of things, like a big appetite, or a big surprise!

Hugo learns that heroes are not just ones with superpowers, there are also heroes in real life, like fire-fighters, rock stars, and even his granny. Even Hugo can be a hero to someone.

Lots of things change when they grow up. An egg becomes a bird, a caterpillar becomes a butterfly and a kid become a grown up. But Hugo likes some things just the way they are!

Hugo thinks he's human because he's got legs, ears, eyes, nose and mouth. But his pet spider and his friend the naughty monkey have all those things too! Felix and Lily help Hugo work out what makes humans different.