Clubber Lang is fictional.
James `` Clubber '' Lang is a fictional character created by Sylvester Stallone for the film Rocky III , which was released in 1982 . Lang is a professional boxer fighting out of Chicago , Illinois and a one-time world heavyweight champion , having taken the title from Rocky Balboa only to lose it back to Balboa in his next fight . Rocky Balboa . The character was created by Sylvester Stallone , who also portrayed him in all seven Rocky films .