Hellboy, his pyrokinetic girlfriend, Liz, and aquatic empath, Abe Sapien, face their biggest battle when an underworld elven prince plans to reclaim Earth for his magical kindred. Tired of living in the shadow of humans, Prince Nuada tries to awaken an ancient force of killing machines, the all-powerful Golden Army, to clear the way for fantasy creatures to roam free. Only Hellboy can stop the dark prince and prevent humanity's annihilation.

Composed of archives and animated sequences, this documentary sheds light on the genesis of the masterpiece by Antoine de Saint-Exupéry (1900-1944) by retracing the last four years of his life, marked by war and his exile in the United States.