The Nebari are featured in the episodes "Durka Returns" (Season 1), "A Clockwork Nebari" (Season 2), and "Fractures" (Season 3). Most of the information about Nebari homeworld culture is conveyed in "A Clockwork Nebari." The most commonly seen Nebari on the show is regular Chiana. Nebari are humanoid in form, with grey skin and black hair (in males) or white hair (in females). Their skin is also immune to solar radiation. Nebari blood is blue in colour.
On their home planet, conformity is enforced by The Establishment, an Orwellian imperial regime that maintains utter conformity, through use of mind control techniques where necessary, both chemical-based and neuro-surgically, upon any and all who are within their influences, no matter the race of the individual. Young Nebari are tested and placed into a position in society based on their abilities, and are expected to conform. Nebari failing to conform to these strict controls are "stabilized" or "mind-cleansed" to fit in. Even displays of heightened emotion are considered to break conformity and are therefore bad: Nebari Establishment officials maintain a sedate, unnervingly calm and stoic demeanor even when torturing enemies or when under attack themselves. A small number of Nebari are natural hermaphrodites called "androgynes"; being inherently incapable of conforming, androgynes are social exiles.
There are two types of mind-cleansing: The first is permanent (except in isolated cases), but takes cycles (years) to complete. The second is temporary, chemical-induced, and can be quickly applied, but does not work on all species; Nebari are immune to it, as are Pilot's species, and species such as Hynerians are affected for only a short time before their quick metabolisms rid their bodies of the drug. Prisoners are controlled with torture collars until cleansing can be effected. The Nebari Establishment claims to be acting for the "greater good" of everyone involved.
Among the Nebari, Chiana is a non-conformist and her brother, Nerri, is a notorious anti-Establishment rebel, making Chiana a target for mind cleansing by the Establishment. In "A Clockwork Nebari" it is revealed that the reason for Nerri's rebellion is the Establishment's great plan to infect significant numbers of every species in the galaxy with a dormant contagious agent; this agent is given to select "non-conformist" Nebari during routine examinations in the hopes that they will leave their home and spread it among the galaxy, primarily through sexual contact. Both Chiana and her brother were carriers, before Nerri discovered the truth and procured an antibody. The Establishment plans to simultaneously activate the disease at an undisclosed future date upon which all infected will run rampant, creating enough chaos within their civilizations to facilitate a galaxy-wide Nebari invasion.
Read more about this topic: List Of Races In Farscape