“In search of muscular realism, animators on Toei’s Arabian Nights’ Sindbad the Sailor brought Chiba in to generate footage of the actor running, jumping, fighting and rolling. The film was them rotoscoped to create some of Sindbad’s action scenes, although the role of Sindbad in the anime was credited only to his voice actor, Hideo Kinoshita.”

Pretty sure my obituary of Sonny Chiba over at All the Anime has a number of things in it you won’t see anywhere else, including his secret anime role and his pirate musical.