Highlander: The Series - Season 3 Episode 6 Courage

Cullen, an old friend of MacLeod's, is burnt out from centuries of playing The Game and has turned to drugs and alcohol to get the courage to keep on playing. Cullen had a run-in with Richie and now he's coming for Richie's head. While playing ""chicken"" with Richie on a mountain road, Cullen crashes head-on into a bus full of passengers, killing many. MacLeod tries to convince Cullen, who he once knew as the greatest of the warriors, to stop using the drugs, but a paranoid Cullen believes MacLeod is just trying to render him helpless. Finally, MacLeod has no choice but to confront his former comrade and defeat him.