Highlander: The Series season 3, episode 18, "Testimony" (1995), follows Duncan MacLeod revealing his immortality to Anne Lindsey while navigating a plot involving an Immortal Russian Mafia leader. The episode highlights a pivotal shift in their relationship as they convince a young woman to testify against the villain. For more information, visit Rotten Tomatoes . "Highlander" Testimony (TV Episode 1995) - IMDb