The Vyuns were the victims of a failed experiment by the Destroyer of Worlds, Linea (met in the episode, 2.03 "Prisoners"). Linea's experiment caused the people of Vyus (P2Q-463) to regenerate and lose their memories. The Vyuns called this event the Vorlix. The SGC, along with Ke'ra, Linea's amnesiac younger self, developed a drug to reverse the effects of the experiment and this helped the people save their society. The Vyuns were introduced in the episode, 3.11 "Past And Present".