When monstrous creatures, known as Kaiju, started rising from the sea, a war began that would take millions of lives and consume humanity's resources for years on end. To combat the giant Kaiju, a special type of weapon was devised: massive robots, called Jaegers, which are controlled simultaneously by two pilots whose minds are locked in a neural bridge. But even the Jaegers are proving nearly defenseless in the face of the relentless Kaiju. On the verge of defeat, the forces defending mankind have no choice but to turn to two unlikely heroes - a washed up former pilot (Charlie Hunnam) and an untested trainee (Rinko Kikuchi) - who are teamed to drive a legendary but seemingly obsolete Jaeger from the past. Together, they stand as mankind's last hope against the mounting apocalypse.

Princess Andromeda is the daughter of King Cepheus, who has gained a victory against the gods. The vengeful god of the underworld, Hades, demands that Andromeda is offered as a sacrifice or he will unleash the Kraken against Argos. A desperate King Cepheus asks demi-god Perseus to find a way to defeat the Kraken. Perseus accepts the challenge because Hades was responsible for his family's death. He discovers that the way to kill the Kraken lies with getting the head of the gorgon Medusa.