Sengoku (1991)

Sengoku (戦国伝承 Sengoku Denshō, "Legacy of the Warring States") is a beat 'em up and the first game of the Sengoku trilogy by SNK for the Neo-Geo. For centuries a cruel warlord has been defeated but has sworn to return in future. When he does he unleashes, undead forces of feudal Japanese warriors to destroy the world of its people, opposed only by the two protagonists, a ninja or a Western cowboy (named Dan and Bill in the SNES version). Source: Wikipedia, "Sengoku (1991 video game)", available under the CC-BY-SA License.