Ensign Tendi has her first day of work on Starfleet's USS Cerritos, where she meets fellow support crew members; Boimler is tasked with a secret special assignment; Rutherford attempts to keep his dating life intact while a disaster strikes the ship.
Boimler is plagued with self-doubt, while Mariner proves herself to be the more naturally talented; Rutherford quits his job in engineering and explores other departments on the USS Cerritos.
The lower decks crew struggle to keep up with tightened schedules; Ensign Mariner and Commander Ransom's mutual lack of respect comes to a head during an away mission.
Captain Freeman seeks payback after Mariner disrespects her in front of the crew; Tendi accidentally messes up a Lieutenant's attempt at spiritual ascension and tries to make good.
Mariner becomes suspicious of Boimler's new girlfriend; Tendi and Rutherford grow jealous of a bigger starship's gear.
Ensign Fletcher makes work difficult for Mariner and Boimler; Rutherford shares a holodeck training program he created with Tendi.
Tawny Newsome
Ensign Beckett Mariner
Jack Quaid
Ensign Brad Boimler
Noël Wells
Ensign Tendi
Eugene Cordero
Ensign Rutherford
Dawnn Lewis
Captain Carol Freeman