Brian Johnson and Sophie Johnson, who hail from Planet Valux, crash land on Earth due to mechanical problems aboard their spaceship. Realizing that they can't get home, they decide to live on Earth, and even adopt three children from an orphanage. However, when their children discovers that their parents are aliens, they realize that they'll have to do what they can to help their new parents learn about the world, all the while preventing anybody from suspecting their true origin.