In Highlander: The Series, the Kurgan's death effectively kicked off the beginning of the Gathering. The Kurgan is mentioned in the episode "The Watchers".
After Darius's death in Paris, in 1993, Duncan MacLeod returned to Seacouver to learn more about the Watchers, and the Hunters. His investigation led him to Joe Dawson, a Watcher, who had no alternative but to tell him who they were. To exemplify the Watchers' knowledge, Dawson showed Duncan his fellow Clansman Connor's, the Kurgan's, and his own personal databases. Among other Immortals listed as being slain by the Kurgan in this database were Ivan Trotski and Flavio Parocchi. In contrast to the Kurgan's background in the film continuity, the series portrays the Kurgan as being much younger, having received his immortality in 1453 (according to the screen display that Joe shows Duncan). According to Dawson, Connor MacLeod did the world "a big favor" by killing the Kurgan.
In the Watcher Chronicles DVD supplements, it's also mentioned that from 1981 to 1985, the Kurgan was watched by future leader of the Hunters, James Horton.
Read more about this topic: Kurgan (Highlander)