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Dethroning Moment: Buffy the Vampire Slayer
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Indigo: The attempted rape. Buffy lay there and cried and begged like a weak little Muggle victim, when she is the goddamn Slayer and could have put him through every wall in the house and beaten him to a pulp... and has done so before!
emeriin: And in the very next episode, she takes her little sister to her attempted rapist's crypt and actually seems upset when she asks Clem when he'll be back. What did you do to my awesome Buffy?!
Peteman: Tara's death by an impossible shot was when Joss proved he could not resist cheap death for drama. And it didn't need to be. She could have been at the window and I wouldn't be complaining so much.
jakelikescheddar: Buffy's "Everyone-sucks-but-me" speech in "Get It Done", including mocking a girl as "a weak idiot" - after she killed herself.
tsstevens: Of all the things she's done this is by far the worst. I was able to get over Angelus, Faith, even Dark Willow, hard as it was. It took a lot for me to like Buffy again after this. Do I feel any sympathy for her for the rest of season seven? No, none whatsoever.
bjchit: Since a few of them already have been mentioned what I think are the show's low points, I'll say when Xander left Anya at the altar. He promised he was marrying her not because he thought the world was going to end in season 5, leaves her because he saw a falsified vision from a demon that wanted revenge on Anya. And his excuse that he doesn't want to be like his alcoholic parents doesn't work—he already isn't anything like them.
NCZ: Completely seconded. Even worse because he knew that the demon was messing with him and that their marriage didn't have to end up that way. That episode was depressing as all hell, and not in a good way like "The Body". It was just painful to watch.
Dagobitus: Xander dumps Anya. That is when I stopped believing in the characters and the story and realized that the show was a non-stop Author Tract. Everything had already gone to Hell and the last remaining tad of joy was Xander/Anya and then Joss even Jossed that.
Tropers/The_Void: The whole of "Wrecked" is just one big Dethroning Episode of Suck, but the worst would probably have to be the inexplicable scene where Amy steals sage from Buffy's house. It pretty much sums up everything that's wrong with the Anvilicious "Magic Drugs" storyline.
Wrybread: The death of Xander's love interest Renee in the Season 8 Buffy comic book (I'm putting it here rather than in the Comics folder since it's the canonical continuation of the TV series). A lazy, obvious plot development that served no purpose other than to kill off an interesting new character and relationship in order to induce cheap angst and set up the Squicky Xander-Dawn relationship. We get it, Joss, sometimes someone you've just fallen in love with dies and it's sad. And apparently if you date someone who wasn't in the TV series it's all the more likely since they're expendable. Now find a new gimmick.
PerfectlyIdiomatic I found it very hard to care about stopping Willow in 'Villains'. She wants to kill an unrepentant murderer and rapist? OK. Let her. And then Buffy says how the human world has laws for dealing with this, except Warren's shown himself far beyond the human world, building jet packs and such and escaping detection for an awfully long time. Just let Willow flay the sod.
RAZ: The second Spike became romantically obsessed with Buffy at the end of "Out of My Mind." As a result he then spent the rest of season 5 stalking her and stealing her clothes and photos to smell/molest/likely do other disgusting things with them which was excruciatingly painful with so many doses of squick that I actually started visibly wincing whenever he started to pop up. The fact that, "The Body" aside, he was shoehorned into every episode just to force in more of these terrible moments quickly helped transform the fifth season into one giant moment of suck for me, which wasn't helped much thanks to a plethora of ridiculous storylines that season incorporated like alien demons from outer space and Riley's character exit that turned him into the equivalent of a junkie with the whole vampire-bite obsession (see? The series did bad "supernatural related-thing = drug addition" storylines even before season 6!). My enjoyment of the series would never really be the same as it was prior to when this turn came about.
abomb30: The episode "Pangs." All of that horseshit with the Indian spirit. Willow spends the entire episode ranting about how the spirit is justified because of horribly they were treated by the settlers. Because obviously in reality the Natives were completely innocent and the settlers were an entirely guilty party. And because the (cartoonishly evil) actions of some people hundreds of years ago justifies murder. Joss fails history forever. And ever. And ever. The whole episode was bullshit.
That Irish Reader: I consider "Once More With Feeling" to not only be one of the greatest Buffy episodes but also one of the greatest TV episodes of all time. It has catchy songs and a perfect mix of everything Buffy likes to deliver all wrapped up neatly in one little episode. However, near the end something happens that infuriates me to no end, mainly the reveal of who summoned Sweet, the magical demon making everyone sing and dance. The episode leads us to believe that it is Dawn but then it's eventually confessed to have been done by Xander. I can not even begin to describe how wrong this is. There are many reasons as to why this is wrong, such as the fact there is zero build-up to it (during the episode Xander is seen acting frantic as he hopes Giles can find an answer), it completely goes against the previous Character Development he got in episodes where Xander abuses magic but at the end learns to not do it and the part that tops it all off is the fact no one, not a single person criticizes him about it. Keep in mind that summoning Sweet ended with numerous deaths of people in Sunnydale and no one seems to give Xander a slap on the wrist. This is both a dethroning moment for the episode and also for Xander.