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Breaking Bad, a show where the very fundamental elements they build upon over five seasons explode in one very famous episode, and before you know it Breaking Bad has ruined TV for you, because you know it can't get better than this.
Children of Men, a story and atmosphere so enthralling, that I consider it exemplary to science fiction.
The Return of the King, or rather The Lord of the Rings trilogy as a whole not only defined the fantasy genre, it still stands on the pedestal as King more than a decade later.