Robotech Seasons

The Earth is invaded by a race of aliens calling themselves the Invid to cultivate Earth's vast supplies of Protoculture.

The 'Robotech Masters' have come to the Earth to claim a mysterious substance known as Protoculture.

Ten years after a mysterious alien ship lands on Earth and is rebuilt with its technology adapted, the alien warrior servants (the Zentraedi) of the ship's owners arrive to retrieve it.