Carl Upsdell and Mauro Casalese direct this animated feature following the adventures of the Marvel Comics characters created by Jack Kirby and Stan Lee. The Inhumans are an offshoot of the human race who boast an array of genetic mutations. Far from lamenting their status as 'mutants', they actively seek new mutations through exposure to the mysterious Terrigan Mists. The Inhumans do, however, generally avoid contact with the outside world. There is great consternation, then, when external forces begin impinging on Inhuman territory. The ruling authorities, led by Black Bolt, attempt to deal with the threat, but with Bolt's brother, Maximus the Mad, threatening revolt from within, it seems certain to be a tumultuous time indeed in the Kingdom of Attilan.