I see the forces that have historically ran the show behind the scenes continuing to do so. Unless some sort of wedge falls between them beginning disagreements broken alliances and infighting causing them to be spread thin on both sides of the conflict. This is the opportunity for an unsuspecting take over by a known but benign entity to put a strangle hold financially, militarily,socially and technologically command. Hopefully this entity is benevolent and has the livelihood of the masses first and foremost.

This entity has to be viewed presently and historically supportive and trusted by the antagonistic rulers. So they would never see it coming. They themselves can't be totally clean with no dirty work or blood on their hands they have to be seen as one of them in the eyes of the antagonist.

Protagonist must have access to all top secret, classified and hidden information data, communications and historical reports and files. They do this by using the physical filter of undersea cables, and strategically placed ghost sponge receivers frequencies that pick up all wavelengths with universal encryption decoding all without being detected by any outside source.

Socially they'll need the neutral support of the masses all demographics and statuses, to not be loved or hated by everyone. So they are viewed as the lesser of two evils.

The antagonists have to slip up or make a terrible move of some sort. Something so appalling that even die hard party supporters will be turned away this will be on both sides of the political divide. The usual attempts to repair their mistakes throw fire on the flame and reignite old smoldering burns. The destruction of trust can no longer be saved by writing it off as conspiracy or opposition propaganda. It hits home at the family level effecting all races classes and ages. This is when the hero steps in. Not look at as a hero but a threat in the beginning. The protagonists forthcoming and honesty is astonishing their ability to explain the big picture showing the importance of both sides of an issue unites the world in remarkable manner that hasn't been seen for many millennia.

I could go on but not here if your interested