In 1999, Adam flew to Romania and filmed a cameo in the film Highlander Endgame. The film was released on September 1 2000.

Adam played the role of Lachlan.

Plot

In 1555, Connor MacLeod (Christopher Lambert) returns to his former home in Glenfinnan, Scotland, to save his mother from his former friend and village priest Jacob Kell (Bruce Payne). Kell executes Connor's mother for witchcraft. Connor kills both Kell and his adopted father, Father Rainey, and sets Glenfinnan ablaze. Jacob Kell is reborn as an Immortal, and vows vengeance against Connor for Rainey's death. He spends the next four centuries killing people Connor cares about. He gathers a posse of lesser Immortals, who overpower other Immortals and allow Kell to take their heads. By 2002, Kell has 661 Immortal kills, making him one of the most powerful Immortals ever.

In 1992, Kell orchestrates the death of Connor's adopted daughter Rachel Ellenstein. Heartbroken, Connor departs for The Sanctuary, where Immortals are under surveillance by a subgroup of Watchers to prevent The Prize from being won.

A decade later, Kell and his posse of Immortals attack the Sanctuary, and Connor is believed to be beheaded along with the other Immortals there. Duncan MacLeod (Adrian Paul), compelled by a vision, begins to investigate and nearly dies at the hands of Kell's posse. Later, he discovers Connor was spared by Kell, so as to allow the evil Immortal to make his life even more miserable. He wants to kill Duncan in order to torture Connor, and given the number of Quickenings he has received, this seems quite likely to occur. Therefore, Connor forces Duncan to kill him, thereby absorbing all of Connor's power in order to defeat Kell.

Amongst Kell's followers is Duncan's Immortal wife Kate, a woman whom he wedded in 1713 and "killed" on their wedding night in order for her to become Immortal. This has driven her into the arms of Kell, and he must earn her forgiveness, or face her as an embittered part of Kell's faction.

In the end, after Kell executes his group in a mock Last Supper, Duncan and Kell have a final battle, in which Duncan is victorious. He then goes to Glenfinnan, Scotland to bury Connor with his wife Heather. The Producers' Cut ends with the revelation that Kate is still alive.

Source: Wikipedia.org