I apologise for the grammatical inconsistency of the post above; you would be right to chastise me for this.

Many shows are shown on television in the last twelve years, and Joss Whedon's shows have consistently been among those that have been shown.

Joss Whedon has served as a writer on some of the most consistently broadcast shows of the last twelve years. People are aware of his online presence, through which he is known, from time to time, to write jokes and other articles intended as non-humourous. Here, he is making a joke about the Terminator franchise.

Certain episodes of season 3 have been stronger than others