An American soldier who had been killed during the Vietnam War is revived 25 years later by the military as a semi-android, UniSols, a high-tech soldier of the future. After the failure of the initiative to erase all the soldier's memories, he begins to experience flashbacks that are forcing him to recall his past.
On July 2, a giant alien mothership enters orbit around Earth and deploys several dozen saucer-shaped 'destroyer' spacecraft that quickly lay waste to major cities around the planet. On July 3, the United States conducts a coordinated counterattack that fails. On July 4, a plan is devised to gain access to the interior of the alien mothership in space, in order to plant a nuclear missile.