Casshern: Robot Hunter
English name: Casshan: Robot Hunter
Genres: Adventure, Sci-Fi
Type: OVA, Episodes: 4
Aired: Aug 21, 1993 to Feb 21, 1994
Studio: Tatsunoko Production
Source: Unknown
Rating: PG-13 - Teens 13 or older
Synopsis:
In the near future, robot technology has advanced to the point of self-awareness. Under the leadership of the "Black King," machines have decimated the human population and conquered the world. Those who survived the early holocaust have been enslaved for life. But throughout the hardships, a lone hero appears as the savior of mankind. He is Casshan - a fusion of man and machine driven to combat Black King and his forces to the end. 

(Source: ANN)