History #1 (Filmation)
He is usually paired with Webstor (another third wave figure introduced into the cartoon series around the same time) and the two of them are often seen to work as a duo. They are first paired in the episode "Disappearing Dragons" which portrays Khan as the leader of the two. He is portrayed as a sly, scheming and sullen character, capable of taking on numerous opponents at once with his sleep mist. Lou Scheimer voiced him with a low, whisper-like, hissing voice.
In the episode "The Good Shall Survive" he demonstrates the power to elongate his arms to grasp his opponent before spraying them. This ability was never mentioned before nor since, be it in the Filmation cartoon or in any other incarnation of the franchise, although to note is that a later Snake Man character, Sssqueeze, had stretchable arms with which he trapped victims. Although the Snake Men were produced by Mattel too late to appear in the cartoon series (although a couple were later adapted as members of The Horde for the spin-off series She-Ra: Princess of Power), it is possible that the producers of the He-Man and the Masters of the Universe cartoon were aware of the forthcoming Sssqueeze figure and adapted the ability for Kobra Khan.
The final produced episode of the series, "The Cold Zone", focuses exclusively on Kobra Khan and his race, the Reptons. We learn in this episode that the Reptons inhabit a quiet underground kingdom beneath a stone pyramid, and are a peaceful race who regard Khan as a traitor since he left them to join Skeletor's forces. The plot features Khan seeking the help of He-Man and his companions in relighting the furnace that heats the Reptons' kingdom, which has been extinguished by an unknown intruder. As the plot unfolds, it turns out that it was in fact Khan who extinguished the flame, and the Repton's ruler, King Pythos, has offered to grant the crown of the Reptons to whoever can expose the guilty party. Therefore, Khan has concocted an elaborate scheme to frame He-Man for the crime so that he can become ruler of the Reptons upon exposing He-Man as guilty. Other members of the Reptons seen in this episode are King Pythos, an unnamed Chancellor, and the court jester, Scales, who reveals Khan as the true criminal
History #2 (MYP Productions)
A descendant of the ancient Repton Clan, Khan became fascinated with the many legends of their victories in the Great Wars. Breaking into the archives of Eternos Palace, he learned that the great King Hsss had been locked in the Void at the end of the war. In a ruse to free his King, Khan joined forces with Skeletor and, with the help of Evil-Lyn, they acquired Zodak's staff, the key to freeing his Snake Men brethren. Together he and Evil-Lyn opened the Snake Pit portal releasing Hsss and his ageless army, returning their terror to Eternia. Khan went on to loyally serve Hsss, controlling his prey with his evil hypnotic mist!
Trivia (Clawful94): Although the episode "The Cold Zone" was made before the idea of the Snake Men was conceived by Mattel, it can arguably be considered that the Reptons are a sub-division of the Snake Men who were permitted to remain on Eternia after defecting from the side of King Hiss. Kobra Khan was voiced by Scott McNeil in the 200X MYP cartoons. He was voiced by Lou Scheimer in the Filmation cartoons.
POP Filmation Cartoon Appearances:
MOTU Filmation Cartoon Movie Appearances:
MOTU 200X MYP Cartoon Appearances: