In third episode of the fourth season, the Lower Deckers are getting back to business as usual. Where "business" is: crawling through jeffries tube in order to be their mortal enemies, Delta Shift, to a hidden terminal that will determine the winners of a lottery for a handful of luxury rooms on the first deck.
And where "usual: is: just after Captain Freeman has been possessed by a cursed mask that gave her strange technological powers in the name of some ancient entity named Minooki that wanted to turn the Cerritos into a early civilization-style temple.
Also, Rutherford and the engineering team attempt to relax on a spa space station.