S6·E3 Sins of the Father

Now that his grandson, Carl, manages the bank, George Thomas can relax with his old friend, Duncan MacLeod. But the good life is cut short when George's car explodes in a ball of flames -- leaving MacLeod to find George's killer. The trail leads to Alex Raven, a beautiful Immortal with a taste for danger and a fifty-year-old promise to fulfill... no matter what the cost.