Invincible

This kung fu fantasy stars Billy Zane as Os, an expert martial artist who's committed to defending the Earth from the Shadowmen, a race of immortals who want to destroy humanity. Os, who used to belong to the Shadowmen himself, renounced his immortality in favor of doing good; now that the Shadowmen have begun preparing for a final attack on Earth, however, Os must train his students to become as powerful as he is.