A cheap faster-than-light drive has permitted populating the galaxy. Each planet has become home for different social groups. 400 years post-diaspora, a Earth spaceship visits three — a 1st step to galactic unification. Things don't go as hoped, as the ship's incompetent military authoritarians encounter three very different societies.
Once a penal colony, the 1st planet is a kleptocratic despotism. The 2nd, Hygeia, is populated by health & fitness fanatic nudists. The 3rd, Kassim, was colonized by a religious group. As the ship arrives they can't find anyone, only …