A psychotic sniper plans a massive killing spree in a Los Angeles football stadium during a major championship game. The police, led by Captain Peter Holly (Charlton Heston) and SWAT commander Sergeant Button (John Cassavetes), learn of the plot and rush to the scene. Still, they may be too late, as an all-star cast finds itself lined up in the sights of a gun-toting madman.

After a cavalry group is massacred by the Cheyenne, only two survivors remain: Honus, a naive private devoted to his duty, and Cresta, a young woman who had lived with the Cheyenne two years and whose sympathies lie more with them than with the US government. Together, they must try to reach the cavalry’s main base camp. As they travel onward, Honus is torn between his growing affection for Cresta.