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Mickey Goldmill, portrayed by Burgess Meredith, served as Rocky Balboa's trainer and mentor throughout the Rocky film series. Goldmill's unwavering belief in Rocky's potential and his tough-love approach played a pivotal role in Rocky's transformation from an unknown underdog to a heavyweight champion. Goldmill's guidance and support extended beyond the boxing ring, shaping Rocky's character and instilling in him the values of perseverance, determination, and humility.