The adventures of Duncan MacLeod, a 400-year-old Immortal who can only die if he is beheaded; conflict inevitably finds him because he is part of the Game, an ongoing battle in which all Immortals have to fight and behead each other until only one is left.

The series continues to follow the adventures of Duncan MacLeod, a 400-year-old Immortal who can only die if he is beheaded. MacLeod is involved in the Game, an ongoing battle during which all Immortals have to behead each other until only one is left.