Mangus: Possesses the knowledge of architecture and the apparent leader of the Jettators - it was he who informed Kortan of the Highlander's coming seven centuries ago. Kortan then stole his blueprints and used them to build his city of Mogonda, where Mangus continued to hide out and spy on the enemy. When Quentin arrived to rescue the Dundees, he let them into the city through the sewers, but only by sacrificing himself in a duel and allowing Kortan to steal his powers was he able to ensure their escape.

Yoshoda: The greatest of the Jettators, leads a monastic life teaching people martial arts. His knowledge is key to using that of the others to defeat Kortan, but he tests Quentin's ability to resist corruption by having a disciple manipulate Quentin, and judges that he hasn't yet earned the right to have Yashoda's knowledge, but promises to reconsider if Quentin matures.

Stevenson: An enigmatic immortal with the knowledge of hydroelectric power. In a desperate attempt to save his eternal life he betrayed the Highlander and instigated a plan to hand him over to Kortan. When he failed however, Kortan killed him and stole his knowledge for himself.

Ilrick: A Jettator with the knowledge of medicine.

Erol: A Jettator with knowledge of oil, dynamite and other secrets of the Earth. He went into hiding to avoid Kortan's henchmen. When the Highlander arrived at his old base they found only Melvyn, an insane ex-employee driven crazy by the loss of his daughter Dana. Believing MacLeod's sister Clyde to be Dana he promptly captured her - thankfully Quentin was able to locate the real Dana inside the city of Mogonda and so save them.

Lancerlay: A Jettator with the knowledge of history.

Olak: The Jettator of the winds. At first he refuses to hand over his knowledge when Quentin's fear of heights places the son of one of his men in serious danger in duel within the city of Mogonda. When Quentin is able to overcome that fear and rescue the boy from certain death above a pit of giant ants ("anomas") however, he reconsiders. His 'quickening' ritual is the first we see on screen.

Volta: A Jettator with the knowledge of nuclear power. Had blue skin due to radiation.

Eva: A woman with the knowledge of how to create and project holograms.

Orane: A blue-haired woman who rules an undersea city and has knowledge of oceanography. Implied to be an old lover of Ramirez.

Fredrickson: Knowledge of genetics. Cloned himself to preserve his knowledge in case Kortan found him, but his clone turned evil.

Matsuda: An Asian Jettator with a knowledge of cyborgs (more properly androids, as his creations were merely artificial machines). He lost a hand to Kortan, and built a cyborg warrior to kill Kortan for him.

Mahata: An old man with knowledge of entomology.

Brana: Has knowledge of linguistics. A coward, he found courage when the woman he was in love with was kidnapped by Arak, one of Kortan's men.

Cornell: A blind Jettator with knowledge of astronomy. He changed his name to Orion and hoped to fight Kortan during an eclipse, where he would have the advantage. However, he had given up his knowledge and immortality to Quentin before then, and stood no chance against a powerful Immortal like Kortan.

Sahevy: A Jettator with a master of botany. In the episode in which he appears, The valley of the Thorn Pods, he is initially thought to be a traitor to the Order of the Jettators for unleashing carnivorous thorn pods on the Valley where he lived; later it was revealed that he was not responsible, and was in fact helpful in stopping the pods. His Quickening ritual is the one we see on the opening credits.