[1] Four U.S. Army soldiers, with nothing in common other than having served in the same combat zone and been shot in the head with bullets cast from fragments of a meteorite, cheat death and begin working on a mysterious project.
Intelligence officer Adam Ballard attempts to unravel the mystery behind the strange behavior of the men, who have each attained I.Q.s of over 200.
Minns begins to show the same brainwave patterns that three other men have shown—each one shot in the head by a bullet made from a meteorite fragment.
Ballard explains to his superior (Ted De Corsia) that he believes Earth has been invaded, and that these four men are in league with extraterrestrials.
Ballard begs the men to fight the "Charlie" in their heads, turn off the force field, and not kidnap the children.
The children are not to be examined, they are to be helped—the alien intelligence behind this project originates from a planet inhabited by a highly advanced, peaceful extraterrestrial civilization that has become sterile and are now unable to perpetuate their species.
"[2] Lieutenant Minns' climactic monologue in Part II was improvised by actor Steve Ihnat, based loosely on the original scripted lines.