One of the shows I've been watching on Hulu is New Amsterdam. After three episodes I'm really impressed by the quality of the story telling. It's not the first story about someone who is immortal but it's probably the most serious take on the question.
But today I discovered that the eight episodes online is all there is because the show was cancelled after less than a season.
It seems this is all too common for intelligent science fiction. Two other programs in this category that come immediately to mind are Firefly and Threshold.
At least this hasn't happened to the best science fiction ever to grace the small screen - the new Battlestar Galactica. That would be too frakking much!