SamSam, the smallest of the great heroes, has still not discovered his first superpower, while at home and at school, everyone has one! Faced with the worry of his parents and the mockery of his comrades, he goes in search of this hidden power. With the help of Mega, the new mysterious student of his school, Samsam embarks on this adventure full of cosmic monsters ...

Following the kidnapping of his cat, a young boy calls upon his superhero identity to go and save him, encouraged by an original mentor.