Watch American Ninja 4: The Annihilation (1990) HD Full Movie Free on solarmovie.do. Watch American Ninja 4: The Annihilation (1990) online free. The two American Ninjas, Joe Armstrong and Sean Davidson, team up to do battle against a terrorist a...The two American Ninjas, Joe Armstrong and Sean Davidson, team up to do battle against a terrorist and his band of Ninjas.