British commando, Captain Curry (Rod Taylor), is hired by President Ubi (Calvin Lockhart) of war-torn Congo, to steal $50 million in uncut diamonds from a time-locked vault before the separatist Simba army that's fighting Ubi's forces and the UN peacekeepers overruns the remote town where the bank that holds the vault is located. Curry teams up with his friend Ruffo (Jim Brown), Doctor Wreid (Kenneth Moore), who's an alcoholic, and Henlein (Calvin Lockhart), a sadistic Nazi who left Germany after WWII to work as a mercenary. The mercenaries reach the town by Ubi's train after surviving an attack from the UN peacekeepers, only to find a number of