The group seeks an energy well in Eastern Europe known as "The Source," believed to be the origin of immortality.
As they approach the Source, the Immortals find their healing abilities failing. The "Prize" at the center is revealed to be mortality and the ability to have children —a sharp departure from the "power of all living things" established in the 1986 original. Critical & Fan Reception Highlander: The Source
They are hunted by "The Guardian," a monstrous being with superhuman speed and strength who protects the Source. The group seeks an energy well in Eastern