Star Trek: Lower Decks is set in the Star Trek universe in the year 2380, in which Earth is part of the multi-species United Federation of Planets. The Federation's military and exploration division, Starfleet, operates a fleet of starships that travel the galaxy establishing contact with alien races. Lower Decks focuses on the support crew of one of Starfleet's least important starships.[1] Unlike previous Star Trek series, whose principal characters are typically starship captains or other senior officers, Lower Decks focuses on "lower deckers", low-ranking officers with menial jobs; the captain and other senior staff appear as supporting characters.

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