Heritron is another world, separate from Earth, but whose people are similar to Earth humans - being genetically compatible with them. Their world is described as 'beautiful but menacing', with stories stating that Heritron's rulers (known as 'The Takers') used to live in luxury in great castles with fine clothes and servants. However, their world is now in decline with decay and ruin everywhere. To support the way they live, they need a constant supply of slaves to operate their machines, they plunder other worlds to get those slaves. Among these worlds was Earth in the past. To access the other worlds, Heritron must be within a suitable range before a Heritronian device known as 'The Box of Destiny' would be used to open a doorway to that world and allow Heritronians known as 'The Catche