Years after the original film, Chris Adams is a marshal. A friend seeks his help with a gang of bandits. He refuses, but after both his wife and friend are killed in a robbery and attempted apprehension, he brings in a group of men to take out the bandits.
And Van Cleef is certainly a better choice of stand in for Brynner, even making a lot of sense as an older and wearier Adams.
But really, this feels like the last gasp at trying to make the franchise matter. And it really does not work. It is kind of a boring retread.
Simply put, this final sequel is not the enjoyable ride the original film was.