A plane carrying a group of students on a State Department goodwill tour crash lands on a deserted island that was abandoned as a proposed atomic testing area. The one adult surviving the crash is seriously injured but he tries to get the students prepared for survival when it appears that there will be no rescue attempt.
When castaways beging falling ill, the group tries to find volunteers to test a chemical that will either cure or kill them.
After Bob builds a dune buggy, he ends up hitting a girl with the vehicle.
After the dead body of a young boy is discovered, the castaways begin to suspect that someone from the group might be a murderer.
The castaways decide to build a new water system for the island.
A group of castaways decides to break away and form their own group on another island.
A pregnant castaway decides to leave her husband whom she was forced to marry.
The castaways begin to realize that they need some boundaries because living without rules or laws isn't cutting the mustard with anyone.
The castaways worry that others may be on the island when they discover a body in a grave and one of them turns up missing.
Susan falls in love with a fellow castaway just when the women on the island begin demanding the passage of laws to protect their individual rights.
Susan begins to wonder about her future with boyfriend after the castaway women fail to get any laws passed to protect their rights.
One of the castaways becomes a self-proclaimed mystic who says that the way to happiness is through meditation and weed. Wash disputes this.
A mentally ill fellow castaway begins having sudden violent outbursts towards George.
The castaways decide to elect an armed peace officer to keep law and order on their island society.
Washington is imprisoned by a group of fellow black castaways who've broken away to form their own segregated society and don't trust him to keep the faith.
A self-sufficient castaway has made herself a home in the wreckage of the plane and refuses to leave even when a dangerous live mine becomes beached nearby.
When a merchant freighter is spotted on the horizon the castaways must decide on whether or not to signal it or continue with their attempts at building their own civilization.