American cowboy Casey Tibbs, a nine-time world champion who left home at the age of 13 in 1942 due to his father's disdain of rodeo, had a rags-to-riches life after his groundbreaking spurring lick was developed and he was launched to stardom. Akin to riding a wild bronc in competition, his unpredictable journey had its grand victories and cheerless crashes. Get ready to "Let'er Buck!"