When humanity beams a radio signal to space, a response comes from'Planet G', in the kind of alien crafts which dab down from the waters off Hawaii. Lieutenant Alex Hopper is a portion of a global naval coalition which becomes the planet's last hope for survival since they engage the hostile alien force of strength, a weapons officer assigned to the USS John Paul Jones. While taking on the plantations, Hopper must try to live up which his brother, and his fiancée's dad, Admiral Shane, expect of him.