For two hundred years the ship's captain has never been challenged. This year someone is running.
The Perihelion left Earth two hundred and eleven years ago and will not arrive for another ninety. Every captain has been chosen by the last, every vote unanimous, every term for life. Then the challenger filed papers, the archivist found the clause that says it is allowed, and nine thousand people who have never had a choice discovered they have opinions. With the hydroponics harvest failing and the systems technician finding things in the ship's logs nobody was meant to see, the first real election in the ship's history has thirty days to run, and every one of them will matter.
5 roles. You take one; your friends take the rest, and the narrator plays any left over. Anyone can bring a character of their own into a role instead.
The ship's eleventh captain, chosen by the tenth, who has governed well for twenty years and never once had to ask for a vote.
A deck-twelve water engineer who filed to run for captain after a meeting about rationing went very badly.
The keeper of the ship's founding documents, who found the election clause, read it aloud at assembly, and has been regretting it ever since.
The chief of the ship's farms, who has kept nine thousand people fed for fifteen years and is watching the wheat die.
A night-shift systems technician who found a door in the ship's logs that leads to records the captain has sealed.