Highlander II: The Quickening

In this sci-fi/fantasy sequel, Connor MacLeod (Christopher Lambert) has become an elderly man after losing his immortality. Living in a bleak future where the world is protected from solar radiation by a massive shield, MacLeod regains his youth when he kills two assassins from his home planet.

This results in an ongoing battle with the villainous and powerful Gen. Katana (Michael Ironside), but MacLeod receives help when the noble Juan Ramirez (Sean Connery) returns.