While guiding a train that's packed with silver across the border to the United States, hired gun Sergei Kowalski (Franco Nero) agrees to help Paco Roman (Tony Musante) and his band of Mexican revolutionaries overthrow the government. But while it's a matter of principle for Paco, Sergei's only in it for the money. Jack Palance co-stars in this 1960s spaghetti Western that's also known as Revenge of a Gunfighter.