You'd think that in a post-"Yellowstone" world, an original Western series with a unique spin on the genre might do well enough to warrant a few seasons. Alas, the AMC+ series "That Dirty Black Bag" remains an underseen Western with great reviews that only lasted a single season. But "That Dirty Black Bag" was the trio's first major collaboration for a United States streamer. Like classic Spaghetti Westerns of old, the series was filmed in Italy and Spain, with Morocco also serving as a location. But "That Dirty Black Bag" also tried to modernize the genre.