Senghis was an Immortal from Mongolia. He and Khabul Khan met Kane in 1241 A.D. They asked him to train them. Kane did, and together they pillaged villages all over Asia. At the year 1595 he followed Kane to the cave of his former mentor Nakano, who was together with Connor MacLeod. When Kane took Nakano's head the cave collapsed. Senghis and the others couldn't get out.
In 1994 after nearly 400 years of imprisonment they escape. Senghis wonders where they are, but Kane says that it doesn't matter as "there could be only one". Then he beheaded Sengis and took his Quickening.