The first three episodes of The Expanse’s fifth season will hit Amazon on December 16, so you still have plenty of time to return to the frontiers of space and revisit season four (or more if need be). But in case you’d rather read a quick refresher instead, we’ve got you covered.
Source: io9 – The Expanse Season 5 Is Almost Here, So Here’s a Reminder of Where Season 4 Left Off