Scorpius, played by Wayne Pygram, is the half-Sebacean, half-Scarran Peacekeeper, and the primary antagonist of the series, relentlessly pursuing John Crichton for the secrets of wormhole technology locked in John Crichton's unconscious mind to create a wormhole weapon. He is the product of an experiment by the Scarrans – his Sebacean mother was raped by a Scarran to see if there would be any benefit in a hybrid. Raised by Scarrans, he has come to hate them, to reject his Scarran side, and to live for revenge against them. His physical attributes and his character traits are influenced by his race. Scorpius first appeared in "Nerve" and made his last appearance in "". Being half Scarran, Scorpius's body produces an extreme amount of body heat, particularly when angry. However, being also half-Sebacean means that too much heat will kill him. To prevent this he wears a full-body cooling suit notable mostly for the interchangeable cooling rods inside his cranium that absorb his excess body heat. He can see temperature gradients, especially of the face, allowing him to tell when people are lying, as described in the episode "Incubator". As a result, John Crichton was forced to enlist the use of herbal drugs to mask his love for Aeryn Sun for fear that he may use that knowledge against them to further his agenda.