Grady Galloway

When a large forest fire breaks out in the mountains of Montana, a squad of 'Smoke Jumpers', the paratroop-corps of fire-fighters in the U. S. Forest Service, is flown to the scene from their regional headquarters in Missoula, Montana. The Forest Rangers, under Cliff Mason, put out the blaze, but several of the fire-fighters are killed. Ed Miller, son of one of the dead rangers, thinks he died because Mason was a coward, and sets out to prove it.

突如、ワシントンに飛来した円盤。降り立った異星人クラトゥは地球人の未来を懸念し、人類に核兵器の放棄を要求する。そして要求が受け入れられない場合、地球上の全エネルギーを停止させると宣言した……。