The former World Heavyweight Champion Rocky Balboa serves as a trainer and mentor to Adonis Johnson, the son of his late friend and former rival Apollo Creed.
 
FUN FACT:  Sylvester Stallone requested that Michael B. Jordan wear the famous American flag trunks that Apollo Creed wore in Rocky (1976) and Rocky wore in Rocky III (1982) and Rocky IV (1985) to keep tradition in the "Rocky" universe.  And while training, Adonis wears a shirt with the message "Why do I wanna fight? Because I can't sing and dance..." This was a line from Rocky to Adrian on their ice skating date in the first Rocky (1976).