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Season guide

Star Trek: Lower Decks: Season 4

10 episodes Premiered Sep 7, 2023 Updated Oct 29, 2026

The fourth season of Star Trek: Lower Decks continues to follow the support crew serving aboard the U.S.S. Cerritos, one of Starfleet's least important ships. Set in the year 2380, the narrative focuses on the professional and personal lives of four ensigns: Mariner, Boimler, Rutherford, and Tendi. Throughout this season, the ensigns face a series of new challenges and are presented with fresh opportunities that test

Previously on Star Trek: Lower Decks

Season 4 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ The series follows the support crew of the U.S.S. Cerritos, a ship considered one of Starfleet's least important vessels.
  • ⚡ The primary characters are four ensigns named Mariner, Boimler, Rutherford, and Tendi.
  • ⚡ The show is set in the year 2380 and features a mix of workplace comedy and science fiction adventure.
  • ⚡ The ensigns must balance their official Starfleet duties with their personal social lives while dealing with frequent sci-fi anomalies.
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Season overview

The fourth season of Star Trek: Lower Decks continues to follow the support crew serving aboard the U.S.S. Cerritos, one of Starfleet's least important ships. Set in the year 2380, the narrative focuses on the professional and personal lives of four ensigns: Mariner, Boimler, Rutherford, and Tendi. Throughout this season, the ensigns face a series of new challenges and are presented with fresh opportunities that test their capabilities. As they navigate their duties and social lives, the crew must contend with the reality that they will remain in lower deck positions for the foreseeable future. The ship continues to be impacted by a variety of science fiction anomalies, requiring the ensigns to balance their daily responsibilities with the unpredictable nature of their environment. This season maintains the established tone of the series, blending the rigors of Starfleet service with the unique experiences of the support crew as they operate on the fringes of major galactic events. The ensigns must adapt to their ongoing roles while continuing to support the operations of the Cerritos during their missions in the 24th century.

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Season 4 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 4 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 4: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

30%
70%
Mytharc (3): Crucial lore & season climaxes
Core (7): Character development & subplots
Side Quest (0): Standalone / filler
S4·E1 Mytharc

Twovix

Sep 7, 2023 · 26 min

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

S4·E2 Core

I Have No Bones Yet I Must Flee

Sep 7, 2023 · 24 min

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

S4·E3 Core

In the Cradle of Vexilon

Sep 14, 2023 · 25 min

Boimler leads his first away mission on an alien megastructure.

S4·E7 Core

A Few Badgeys More

Oct 12, 2023 · 27 min

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

S4·E8 Core

Caves

Oct 19, 2023 · 26 min

The Lower Deckers go on a classic cave mission.

S4·E9 Mytharc

The Inner Fight (1)

Oct 26, 2023 · 27 min

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

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