Farscape/S

Salis
Salis is a member of the Nebari Establishment and upholds strict standards in regards to behavioral discipline. He used Nebari brainwashing techniques to alter the aggressive personalities of the former Peacekeeper captain Selto Durka and is also responsible for apprehending the Nebari refugee Chiana. After a crash encounter with the Leviathan ship Moya, Salis brought Durka and Chiana on board. One of Moya's passengers, John Crichton instantly took a dislike to Salis, particularly in how he treated Chiana, who appeared to be completely helpless. Salis was later found dead, but the identity of his murderer is unclear, though it was likely either Durka or Chiana.

Selto Durka
Selto Durka was a member of the Peacekeepers and the captain of a command carrier known as The Zelbinian. More than 130 cycles ago, Durka was responsible for imprisoning and torturing the deposed Hynerian dominar Rygel XVI.

During an attack against a Nebari host ship, Durka faked his own death and abandoned his crew. He was subsequently captured by the Nebari leader Salis and placed into cryostasis where he underwent mental cleansing - a form of brainwashing designed to remove all negative tendencies from an individual. Durka remained in this state for many years until a chance encounter with the crew of Moya reunited him with Rygel XVI. Seeing Rygel broke the mental conditioning and Durka returned to his old self. Rygel attempted to kill him with a bomb, but this tactic failed. Salis was later found dead on the ship, though it is unclear whether Durka had anything to do with his death. Durka tried to take command of Moya, but the crew members fought back, driving him off the ship back onto the now-empty Nebari vessel.

Sebaceans
Outwardly, Sebaceans appear no different from a baseline Earth human and in fact, are descended from ancient Earthlings. Another race of aliens, the Eidolons, took members of Earth's humans from their home world and over the course of centuries, they evolved into the present day Sebaceans. Physiologically however, there are radical differences between Sebaceans and humans. Though they have stronger physical attributes and more acute senses, Sebaceans are extremely susceptible to heat. Intense amounts of heat will cause a Sebacean to slip into a delirium, which is ultimately fatal.

More than any other race in the universe, Sebaceans are genetically compatible with other races for the purposes of producing offspring. Officer Aeryn Sun had a child with Earthling John Crichton. The pregnancy no small degree of complication however, as Aeryn's baby had to be physically midwifed through a surrogate vessel - the Hynerian Rygel XVI. The Peacekeeper commander Scorpius is a hybrid of two seemingly incompatible races - Sebacean and Scarran. Because of their differing biology, Scorpius is forced to inject a heating/coolant cylinder into his head at regular intervals or else he will die.

Sebaceans comprise the majority of a totalitarian regime known as the Peacekeepers. The Peackeepers are a territorial military dictatorship for hire who are at odds with several rival species, most notably the Scarrans. The Peacekeeper militia is one of the strongest in the galaxy, made up of massive command carriers and squadrons of Peacekeeper Prowler and Marauder ships. Raised from birth to lead a military lifestyle, a Sebaceans first and last duty is to the Peacekeepers.