Science fiction preoccupied with looking backward — at a past era, or an earlier vision of the future.
1939, an alternate New York besieged by giant robots stomping through Manhattan. Mercenary pilot Joe 'Sky Captain' Sullivan and journalist Polly Perkins — his ex — race to uncover who is behind the attacks, chasing the trail across the globe to a hidden island fortress where a mad scientist's decades-old plan for 'the world of tomorrow' is finally coming to fruition.