On the planet Terranu two families have established a research base to look for extraterrestrial life. One day four young friends spot a watery tentacle slither out of the nearby riverand a pair of eyes watching from across the water Soon the two families meet the planets natives but they arent pleased by the humans presence. The aliens challenge them to a contest. If the humans win they can stay on Terranu. But if they lose they must leave immediately. Its up to the young friends and their special powers to win the contest. Will their families be forced to leave the planet forever Or will the humans and aliens learn to live together in peace