Set just before World War II the story follows J.P. Brandt, a young American Air Force test pilot who is publicly humiliated and court-martialed after a stunt in a plane goes wrong, which endangers President Roosevelt. Despite this, he is able to get a job to pilot an experimental plane from the North to the South Pole. However, during the journey the plane is attacked by a Giant White Eagle, resulting in Brandt and the Crew crashing onto an undiscovered island with living dinosaurs, strange creatures, and a tribe of Vikings who ride giant eagles.
After Brandt befriends the Vikings and manages to tame the island's apex predator, the legendary White Eagle who brought down his plane, naming him "Lindy", he discovers that the Nazis are planning to attack the United States with a new superweapon and Brandt and Lindy have to rally the Vikings to fight them.
