Some TV episodes entertain us and enliven our evenings. But other seem primarily designed to break a viewer psychologically, and take bloody bites out of our sense of well-being. Today, we’ll be looking at the latter.

By Amanda Yesilbas and Charlie Jane Anders. We all live in fear of the day when Game of Thrones starts to suck. We've lived through this trauma before — many great television shows went astray, often due to one highly questionable decision. Here 10 once-terrific shows, and the exact moment they started to suck.

There are so many artificial intelligences that are evil: they try to kill their creator, or kill all humans, or take over the world, or all three. But some AIs do this with charisma and style, while others are complete dicks about it. Here’s a look at a dozen computers who must have had “be an asshole” near the…

The Final Four is now set, in our quest to find the greatest science fiction and fantasy TV show of them all. And today, you'll be voting on the first of two titanic semifinal match-ups. The X-Files vs. the original Star Trek: who ya got!? Also, Firefly, Buffy the Vampire Slayer, and the rest finally put in an…

We've now reached the Elite Eight in our quest to find the great sci-fi and fantasy TV shows of all time. We've got some fierce match-ups for you to vote on today: Star Trek vs. Fringe! The X-Files vs. Game of Thrones! Doctor Who vs. the BSG reboot! The Twilight Zone vs. Star Trek: The Next Generation! The polls are…

The first round of our tournament to determine the best sci-fi and fantasy show of them all is now in the books, and 32 teams are left to battle it out for the title. Vote now and decide the bracket fates of Doctor Who, The X-Files, Twilight Zone, Fringe, Lost, Game of Thrones, both Battlestar Galacticas, three Star…

The X-Files had some high and lows during its 9-season run, but man, those lows were abysmal. Trying to figure out the Worst Episode Ever of The X-Files is as big a mystery as most of the X-Files themselves. Still, if you had to pick, you probably couldn't do much worse than “Fight Club,” a tale of bad wrestlers,…

It's March, which means it's time once again for the most important tournament of our age: io9's March TV Madness. Yes, after crowning the best and worst sci-fi movies of all time, this year we turn our attention to television, as 64 of the best sci-fi and fantasy shows ever made square off in our bracket. It's time…

Each week, we've been looking at webcomics new and old, bringing you some of the best of what we've seen online. 2012 brought us a wide range of genre webcomics, from a fanciful tale of an artist and his editor that uses all three spatial dimensions to one of the sweetest fan comics DC has ever inspired. In no…

The best science fiction and fantasy television hooks you with endless suspense... including hair-raising cliffhangers. But only the greatest cliffhangers can make you throw your remote at the screen, and keep you wondering for weeks. Here are the 20 awesomest.