Primitive Aliens — The world is populated by a large number of sapient aliens that have yet to develop advanced technology. The human colonists may have a friendly or hostile relationship with the aliens, but a certain intrinsic tension is likely. Small human colonies might have been enslaved or otherwise subjugated.
Secret Masters — The world is actually run by a hidden cabal, acting through their catspaws in the visible government. For one reason or another, this group finds it imperative that they not be identified by outsiders, and in some cases even the planet’s own government may not realize that they’re actually being manipulated by hidden masters.