The Hunters | [s1e22]

An ancient immortal and Duncan's spiritual mentor. His death in this episode is a major turning point, ending his role as a source of peace and wisdom for MacLeod.

Horton becomes one of Duncan’s most persistent and dangerous human enemies, appearing in several subsequent seasons. [S1E22] The Hunters

This episode shifts the series' focus from purely "Immortal vs. Immortal" duels to the existential threat posed by humans who know their secret. "Highlander" The Hunters (TV Episode 1993) - IMDb An ancient immortal and Duncan's spiritual mentor

While most Watchers simply observe, this episode reveals their existence to Duncan for the first time, setting up the central lore for the rest of the series. Critical Plot Points for Fans [S1E22] The Hunters