Three years later, Donnie is a successful boxer and an international star, riding high on a string of wins, getting engaged, and becoming a father. His streak of luck ends when Ivan Drago, still bitter over his decades-ago fight with Rocky, insists on pitting his own son, Viktor, against Donnie. Both Viktor and Donnie are forced to face their families' legacies, all while trying to make their own mark in the boxing world.