SCIFI.COM - Farscape

Sebaceans are carbon-based bipeds, not very large nor strong nor particularly resistant to injury. What they lack in strength, however, they more than make up for in number and intelligence... and, in the case of Peacekeepers, cunning.

Sebaceans have a weakness to heat. Warm temperatures that most other lifeforms can tolerate can be deadly to Sebaceans: delirium sets in, followed by what they term the "Living Death" -- a comatose state from which there is no return.

Peacekeepers are predominantly Sebacean. However, there are many Sebacean-inhabited planets with no military presence whatever. Farming and commerce are the principal pursuits of non-Peacekeeper Sebaceans.

However, most Sebaceans we've encountered -- such as Officer Aeryn Sun and Captain Bialar Crais -- are Peacekeepers.

Although John Crichton could easily pass for Sebacean, he claims he is not -- he is another species entirely, one he calls Human. Humans, he says, are much less technically advanced than Sebaceans; Humans all still live on only one planet ("Earth," the location of which Crichton does not know). Humans are also much more heat-tolerant than Sebaceans; they have no direct equivalent to the Sebacean Living Death.