Creed (Blu-ray release 2016-3-1) has Rocky Balboa train the son of Apollo Creed.  The movie mirrors Rocky (1976) in that an underdog challenges the champion.  Although it does not deviate from the established sports movie formula, or the Rocky formula itself, it is extremely well executed.  In particular, it finds a way to integrate the history of Rocky, and contrasts his decline in health and the growth of Creed.  It is a marvelous transition from the established Rocky movies to a new franchise.