L'humanité s'apprête à mettre au point une nouvelle mission spatiale : la conquête de Prométhée, la dixième planète du système solaire où règne une grande prospérité. La fusée, pilotée par plusieurs astronautes commandés par le capitaine Cosmos, est victime d'un mystérieux accident juste en dehors de l'atmosphère. L'équipage n'a plus rien à faire et Arin, le fils de Cosmos, voit la fusée de son père exploser dans le ciel. Le nom de son père est terni par les accusations de trahison portées par le professeur Doppler, un scientifique maléfique opposé dès le départ à l'approche du plan Prometheus. Arin grandit avec la honte de sa figure paternelle et décide de s'inscrire à l'académie d'aviation pour devenir un grand pilote. Dix ans plus tard, le garçon est enrôlé à la base de Yasdam, une fotezza militaire dirigée par le brillant Dr Galax.

Le mystérieux individu qui a aidé Arin lors de la première bataille se présente à la base de Yasdam sous le nom de Mister X. Il ne se souvient que d'avoir été un soldat esclave de Doppler et a maintenant l'intention de se ranger du côté des membres de la base pour vaincre son ancien maître. Une analyse avancée de la mémoire du soldat révèle qu'il a participé d'une manière ou d'une autre au premier projet Prometheus, peut-être comme l'un des scientifiques enlevés par Doppler. Son visage est également recouvert d'un masque métallique qui masque ses traits et dont le but est le contrôle mental par Doppler. Actuellement, cette fonction est inactive, mais il est à craindre que, tôt ou tard, la conscience de l'homme soit submergée par les ondes mentales de son ancien maître. Un nouveau robot ennemi attaque la base de Yasdam et Mister X décide de l'affronter afin de gagner la confiance de ses nouveaux camarades et demande expressément l'aide d'Arin.

Le capitaine Dan choisit ses élèves pour devenir de vrais pilotes : Kauban, Tommy et Arin. Ainsi commence un entraînement très dur et sévère qui met à rude épreuve le corps et le psychisme des trois garçons qui, cependant, supportent stoïquement les tests auxquels ils sont soumis par le capitaine. Lors de la dernière session d'entraînement, un monstre Doppler arrive également et abat les trois avions des garçons. Seule l'habileté du capitaine Dan permet de sauver la Terre et la vie des trois garçons.

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