Boyka: Undisputed 4 is a 2017 American-Bulgarian martial arts film directed by Todor Chapkanov, and written by David White and Tony Mosher from a story by Boaz Davidson. It is the sequel to the 2010 film Undisputed III: Redemption. Scott Adkins reprises his role as Yuri Boyka. On September 22, 2016, the film premiered at the Fantastic Fest in Austin, Texas. The film was also released theatrically in some Middle Eastern markets on July 27, 2017.