The Creed movies grew out of the Rocky movies but may have just surpassed them, and their next installment could prove that beyond doubt. The best boxers in Rocky and Creed all have a few key things in common – a rough internal struggle underlying the one in the ring, determination, and abs of steel. While this popular formula for a boxing movie character has succeeded over and over again since the release of Rocky, the older movies didn’t always make good use of it. Meanwhile, Creed 4 may sustain the franchise’s success.