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Kain (禍因 Kain?) is a fictional character who is the major villain of the first Tenchi Muyo! movie, Tenchi Muyo! in Love. He is an incredibly powerful entity who is considered a Super A-Class criminal by the Galaxy Police.
One hundred years before, Kain was on the loose, destroying hundreds of starships and thousands of lives. It was only after a combined effort with the Galaxy Police and the supreme sacrifice of the Jurai emperor, that Kain was finally captured and locked away in the subspace room of G.P.H.Q.
However, one hundred years later, Kain broke out of the subspace room, destroyed G.P.H.Q. (but not after getting off a warning), and retreated twenty-six years in the past, where he hopes to kill Achika Masaki, which would eliminate Tenchi and affect the futures of Ryoko, Ayeka, Sasami, Ryo-Ohki, Mihoshi, and Kiyone.
Despite being said to be immensely powerful, Kain was sealed up rather easily by one of Washu's creations in a sub-space reality. Though he dragged Achika and Nobuyuki in with him, he was forced to show his draconian face when Tenchi, Ryoko and Ayeka entered his prison-world to save Achika. Though Kain easily overpowered them, he was in turn destroyed when Achika awakened her Jurai powers and used the Tenchi-ken - which became a naginata - to bisect Kain and end his reign of terror. Kain's remains were destroyed by Kiyone with the Dimensional Cannon which destroyed the subspace that Kain was in after Achika barely broke away from Kain during their escape.