Based on the sprawling sci-fi epic, "Robotech" takes place at a time when Earth has developed giant robots from the technology on an alien spacecraft that crashed on a South Pacific isle. Mankind is forced to use the technology to fend off three successive waves of alien invasions. The first invasion concerns a battle with a race of giant warriors who seek to retrieve their flagship's energy source known as "protoculture," and the planet's survival ends up in the hands of two young pilots.