The Octagon (1980).
Haunted by painful memories of his youth training to be a fighter, Scott James (Norris) is drawn into a deadly game of survival when he is a hired by a wealthy heiress (Carlson) to infiltrate a vicious international terrorist organization. When Scott realizes this organization is run by his adopted brother (Tadashi Yamashita) he must face him and his past in the deadly maze of doom…The Octagon!
Directed by Eric Karson. Starring: Chuck Norris, Lee Van Cleef & Karen Carlson. (104mins).