In the present day, 121-year-old Jack Crabb, the oldest living man in the world and residing in a hospice, recounts his plentiful life story to a curious historian. Among other things, Crabb claims to have had been a captive of the Cheyenne, a gunslinger, an associate of Wild Bill Hickok, a scout for General George Armstrong Custer, and the sole white survivor of the Battle of Little Bighorn.