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 ...

A French resistance group frees twelve captured soldiers from a German prison camp, but apparently there is an additional prisoner among them who is suspected of being an enemy spy.