A delightful play with simple sets. Hyjack Over Hygenia is set in an aeroplane interior, on a roof, in a throne room and in a bedroom. Hygenia is the cleanest kingdom in the world. Disease is unknown. But one day a villainous Measle enters illegally and starts bringing the inhabitants out in spots. It is all the plot of Dr. Spicknspan who, owing to the pervading healthiness, is always out of work. Things look serious, but the plot is foiled by the gallantry of the royal staff: peace, health and cleanliness are restored.