The bad guys in The Homeward Bounders
are a race of mysterious beings known only as Them
have no new ideas of their own, preferring to steal them from other people. One of the ideas They
stole gave Them
a way to control worlds, and They
spend most of Their
time playing with worlds as if they were games.
Konstam believes Them to be a type of demon, but it is unknown whether They are actually related to the demons with which he is familiar.