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One of Mumm-Ra's generals, leader of the Jackals.
Kaynar is one of the Jackals who reside on Third Earth, he had been imprisoned by the Dogs for crimes against their people, Mumm-Ra arranged for Slithe to break Kaynar out of prison, at which time he killed some of the dog guards for fun. He was likely a prisoner in Dog City, but remained imprisoned rather then being allowed to fight for his freedom in The Pit.
Kaynar is a character created for the modern ThunderCats series, he is based on Jackalman from the original series.