John Wayne as Sean Mercer

Hardy Krüger as Kurt Muller

Elsa Martinelli as Anna Maria 'Dallas' D'Allesandro

Red Buttons as Pockets

Gérard Blain as Charles 'Chips' Maurey

Bruce Cabot as Little Wolf

Michèle Girardon as Brandy de la Court

Valentin de Vargas as Luis Francisco Garcia Lopez

Eduard Franz as Doctor Sanderson

Sam Harris as Shopper at Macy's (uncredited)