In the lawless frontier town of Brownsville, Texas, a boy and his parents ride a carriage down a crowded street - when a kill-crazy band of kidnappers strike suddenly. Now, to rescue his family, veteran rancher Charley Sunday cobbles together a ragtag posse that starts with an outlaw and an Indian - and picks up recruits, weapons, and a lot of trouble all the way down into Mexico.
In the waning days of the Wild West, Texas rancher Charles Abner Sunday wants to leave a legacy of the Old West to his grandson Henry-Ellis. Sunday buys 300 head of Texas longhorn cattle and leads his grandson - along with a ragtag crew of cronies and misfits - on an old-fashioned cross-country cattle drive. As the drovers struggle to push their 300 charges across a swiftly changing American frontier, they butt heads with a Colorado meatpacker hell-bent on living in the wild, wild past.