A young man seeks to prove his army officer father was not a traitor, to do so he sets out on a mission to take out the men who murdered him with the help of a Mexican bandit who knew his father.

One Against One...No Mercy is a Paella Western. Like many others it is a Spanish-Italian co-production but unlike most, it is primarily an Iberian rather than a spaghetti production. Whatever the case, it sports a plot-line that can be found in many Italian westerns from the time seeing as it is essentially a revenge-themed story featuring a mysterious loner with superb weapon skills and with a comic Mexican bandit thrown in for good measure. So you could say that it isn't a film with a massive amount of originality. But I actually found this one to be clearly above average for this kind of thing. Its Spanish leanings came through by way of slightly less typical music and its feel was a little lighter overall. But it also has a very satisfying and pleasingly unpredictable ending which rounded things off rather well. The cast as a whole wasn't very familiar to me mostly, aside from Eduardo Fajardo who was the chief villain, he also played a very similar role in Sergio Corbucci's highly influential earlier spaghetti western, Django (1966). On the whole, this is one is well worth seeking out, especially if you wish to expand your knowledge of the Paella western sub-genre.