Plot Summary for
Highlander: The Source (2006)

The world is falling into chaos. As he roams a crumbling city, Duncan
MacLeod, the Highlander, remembers happier times before the love of
his life left... Hopeless and alone, MacLeod finds his way to a band
of immortal companions, including his mysterious friend Methos, and a
mortal, Watcher Joe Dawson. Together this small group sets out on a
quest to find the origin of the first Immortal and The Source of their
immortality.

http://www.imdb.com/title/tt0299981/