I'm always shocked when people have not heard of this series. It had the unfortunate effect on me of making everything else not quite good enough. The acting, Ben Browder, Claudia Black, Gigi Edgley (and everyone else in Australia) is fantastic. The design is mind blowing and the stories individually and over the whole arc are so amazing. At first I thought I would be thrown out of the story by the animatronic characters( Jim Hensons creations)-- just thought they would make it too young and hard to suspend disbelief, but the guy who voiced Rygel -- can't remember his name but he really sold it. I stopped looking at a puppetty thing and was totally engaged in his character. This isn't really a fourth season review, this is the whole shebang. Get it. Eat it.