
The fourth season of Star Trek: Lower Decks finds the U.S.S. Cerritos ensigns being challenged in new ways and given new opportunities, while also learning they’ll be “lower decks” for a long time to come.

The Cerritos ensigns must assist a caretaker on the voyage of a historically significant starship.

Mariner tries to get demoted, Rutherford tries to get promoted, and Boimler makes a big move.

Boimler leads his first away mission on an alien megastructure.

Tendi is summoned back to Orion for a wedding.

A trio of Betazoids cause chaos on the Cerritos.

Three computerized villains return to cause problems for the Cerritos crew.

Captain Freeman assigns the Lower Deckers an overly safe mission to try and keep a self-destructive Mariner out of danger.