After being frightened by stories of burglars terrorizing Danfield, Lucy and Viv learn Judo to protect themselves against wrong doers.

A social worker who recently lost her husband investigates the strange Wadsworth family. The Wadsworth's might not seem too unusual consisting of the mother, two grown daughters and the diaper-clad, bottle-sucking baby. The problem is, the baby is twenty-one years old.

Two escaped convicts are found hiding in a rocket ship built by a renegade inventor, who forces them to become the crew for a trip to the Moon. Also on board, as inadvertent stowaways, are his assistant and his secretary; and none of them are aware that the inventor is actually a Lunarian explorer sent to Earth by the dying Lunar civilization.