Lt. Commander Data(Brent Spiner), on a mission to observe the race of Ba'ku, suddenly behaves as if having to fear for his existance. The peaceful Ba'ku, whose planet offers regenerative radiation and therefore incredible lifespans, live in harmony with nature and reject any kind of technology. Their planet and their culture is studied by Starfleet and the associated Son'a - in secrecy. But the So'na, lead by Ru'afo(F. Murray Abraham), intend to abduct the Ba'ku in order to take the planet for themselves and for the Starfleet officials who all would like to regenerate their bodies. But they did not think of the loyalty of the Enterprise's crew to the Prime Directive.