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'Creed II' packs 'Rocky IV'-powered punch

(CNN)"Creed II" represents the square root of "Rocky IV," with all the tantalizing side plots that entails. Michael B. Jordan and Sylvester Stallone again provide a potent one-two combo, in a movie filled with nostalgic callbacks that make the most of the franchise's durable formula.Nobody should have any illusions about what "Creed II" is. The first bout, with "Black Panther's" Ryan Coogler as ringmaster, was as much a remake of the Rocky films as a long-deferred sequel to them, from the training sequences to the melodrama to the stirring fanfare borrowed from Bill Conti's score.There's a reason, though, that series piled up so many Roman numerals, even if it became increasingly ridiculous the farther it got away from the original's charm ...