In Allos: Land Behind the Moon, Henrietta leaves her home at the space station with her grandmother Yaya and their talking dogs, Howser and Samson, in a spaceship "The Luna" to rescue younger brother Alexander from the hidden land behind the moon. They meet some of the citizens of Allos from Greek mythology-Bo tes the Herdsman, Cancer the Crab, Canis Major and Minor the Big and Little Dogs, Cepheus the King, Cassiopeia the Queen, Corvus the Crow, Cygnus the Swan, Draco the Dragon, Ophiuchus the Serpent Bearer, Orion the Hunter, Pisces the Fish, Ursa Major and Minor the Great and Little Bears. Four separate adventures on both sides of Eridanus the River end in a ferocious battle and a surprising way to get back home.