Shinzo Ningen Casshern, also known simply as Casshan, is a classic anime series that debuted in 1973. It follows the story of Tetsuya Azuma, a young man who turns himself into a cyborg named Casshern to fight against an army of androids led by Braiking Boss. The series explores themes of humanity, technology, and the struggle for freedom, and it has left a lasting impact on the genre with its unique story and memorable characters.