Warriors Orochi (無双OROCHI Musō Orochi), is a PlayStation 2 and Xbox 360 hack and slash video game developed by Koei and Omega Force. It is a cross-over between the Samurai Warriors series and the Dynasty Warriors series. The game was released on March 21, 2007 in Japan, September 18 in the United States, September 21 in Europe, September 27 in Australia and September 28 in New Zealand. The story is about Yamato no Orochi, a powerful serpant king, who created rift and time in space to bring all the mighty warriors from the Three Kingdoms and the Sengoku period together.
Note: The Dynasty Warriors characters in Warriors Orochi also come from Dynasty Warriors 5.