Recent ads for the upcoming season give no indication that The Expanse viewers should check in advance of the official release date:
At the end of The Expanse Season 3, humanity witnessed the opening of the Ring Gates—a network of wormholes connecting our solar system with hundreds of other worlds. Some as-yet-unknown disaster in the far-flung past has left these worlds presumptively empty and ready for a new wave of human explorers and colonists.
When Season 4 kicks off, a dispute is already underway over control of one such alien world, named Ilus. After an energy company with mining rights finds Ilus already occupied by Belter colonists, tensions flare. The U.N.’s Chrisjen Avasarala (Shohreh Aghdashloo) sends in the crew of the Rocinante to try and mediate between the two sides, a mission quickly complicated by alien technology awakening beneath the planet’s surface.
