Invaders have arrived on a second Earth called Maris in the year 2387. The natives are helpless as their weapons are ineffective against the invaders. The exception is three weapons ...

Hattori a ninja boy who has come from the Iga mountains is now a part of the Mitsuba family along with his brother Shinzo and his ninja dog. Hattori helps Kenichi with his problems and constantly keeps an eye on him as a good friend.

A Japanese teenager and his friend investigate a mysterious 2000 km island that appears out of nowhere. They are pursued by an evil organisation, GAIL, and join forces with the island's defender, Giant Gorg.