Four young friends must use their special powers to compete against the water-dwelling natives of planet Terranu, in a contest that will decide if their families may stay or must leave forever.
After losing their communication link with two members of their team, the remaining young miners abandon their expedition on Asteroid AX245 to search for their missing friends.
In the distant future, when alien Hunters, masters of camouflage, terrorize humans, Rio and his friend Ani are separated from their parents while trying to leave Humanhattan for the government Fortress.
When the leaders of Fortuna colony decide they must leave after some human colonists disappear, their alien hosts, who welcomed them but never showed themselves, invite the colonists to a final feast.