Buffy: Where the Wild Things Are, aka “that stupid episode where Buffy and Riley can’t stop having sex because of some spell.”
Supernatural: Route 666, aka “the racist truck episode”. Racist truck? WTF?!
I’m not super-proud, but I like Bones, okay? I still like it. But they lost all my respect when the writer’s strike happened and they yanked our emotions around like a kid with an abused puppy for the first ten minutes and then got onto the business of “solving” the season-long mystery with some made up stupid shit, where the apprentice was somebody it couldn’t really be and the master was nobody at all and they wrapped up what could have gone on for seasons in half an hour flat. A stupid half an hour.
“Beer Bad” is also a candidate. For Angel it has to be the muppet episode-I’ve never had my willing suspension of disbelief as smashed, folded, spindled, and mutilated as it was the instant Angel appears on screen as a muppet, and then starts wrestling with Spike.
<oy vey…>
As far as Trek goes, CBS.com finally got all their TOS eps up there, and I tried “The Way to Eden,” on a lark, but unlike “Spock’s Brain” it had no “so bad it’s good” moments. Dr. [del]Cauliflower[/del] [del]Seven[/del] Sevrin was lame and uncompelling as a loony villian, and the space hippies…ackkkk.
I like Beer Bad, and Bad Eggs isn’t horrible, but this is the worst episode related to anything Joss has ever done. Even the movie is better than this.
I feel like anyone who responds differently has repressed their memory of WTWTA.
Wee little puppet man, wee little puppet man! I’ll have your share, that was frigging awesome!
For Angel, there was something in the first season about neo nazi aliens. Ran away screaming
Dammit! Now I have “Yvan Eht Nioj” stuck in my head. 
It had the really good subplot about Ivanova, her unresolved daddy issues and the rabbi which I really liked and there’s one bit of foreshadowing.
The boxer tells Garibaldi that Garibaldi’s weakness is that he trusts his friends too much and never watches his back. Which comes into play about 5 episodes later
I’d argue that “Grey 17 is Missing” is a much worse episode.
Are either of those episodes worse than The Way to Eden? With the groovy, singing ‘space hippies’, really, Herbert?
It seems like sci-fi and wrestling do not go together (I mean, are there any Trekkies who are also UFC fans?). Star Trek: Voyager’s Tsunkatse was a very thinly veiled attempt to have “The Rock” guest star on the show. The plot device was as contrived as a standard Gilligan’s Island episode (oh, the Harlem Globetrotters just happened to appear on the island, eh?) but at least Gilligan’s Island is entertaining and you’re more apt to suspend disbelief for that show.
As a Simpsons fan, there are (unfortunately) a limitless number of options from seasons 12-21. As bad as Yvan Eht Nioj and Duncan the Race Horse were, there were still some redeeming moments. Lately, it’s been like panning for gold.
Hmmmm…The Wire didn’t have a WORST episode. 
Ok, to be fair, pick one at the tail end of the final season.
OK, I’ll grant that “Gray 17 is Missing” was pretty awful, too, but I still maintain that the lack of connection to other episodes made “TKO” worse. OK, there was the thing with Ivanova and her dad, but that was introduced as the C plot in a single earlier episode, and never brought up again after TKO, so it’s not really much of a connection. And while “watch your back” might count as foreshadowing if Kosh or someone said it (heck, everything Kosh says counts as foreshadowing, no matter what it is), when some punch-drunk idiot wannabe who only appears in one episode says it, it doesn’t mean anything.
Mind you, I can’t actually remember what connection to the plot “Gray 17” had, but I know it had more than that.
Well, I don’t know if it’s my favorite series—though it’s gotta be close. How couldn’t it be?—but I’ve got another ST:TNG nomination: “Emergence”. That was the one from the seventh season where the ship got nicked by a space-storm (offscreen, apparently) which apparently mutated it so it starts evolving into an intelligent lifeform, and you could see the elements of it’s subconscious incarnated as characters on a train in the Holodeck, and it built a really mediocre CGI effect “offspring” which flew off into space in the end and then everything went back to normal. Or some damn thing like that.
The whole sorry thing was just an indication that the series really wrapped up just in time, instead of trying to plow on for more seasons. It felt like a Voyager episode more than anything else—but at least it had Picard discussing The Tempest, in-character, which was neat and actually tied in with the episode. Voyager probably would have had Paris tinkering with an Edsel or someone mooning over their annoying love life or practicing being self-righteous or something.
[Anime geek]
The Davyback arc in One Piece. It read like filler in the manga, and wasn’t any better in the anime. Stupid, pointless episodes. I hope that the Foxy pirates don’t play some sort of key role later, because they were such worthless villains. I also wasn’t a fan of Thriller Bark, though the anime portrayed it slightly better than the manga, I think.
[/Anime geek]
There’s two episodes of Futurama that stick out to me. The first one is That’s Lobstertainment. There’s a lot of funny jokes in the episode, but I just can’t buy there being another silent movie era in black and white. The next one is the one where Bender becomes joins All My Circuits. As with That’s Lobstertainment, I just can’t stand episodes of shows where a non-famous group of people suddenly gets famous, then in the next episode they act like it never happened.
Buffy’s “Bad Eggs” gave us Cordelia in a black leather miniskirt, vest and boots. The plot was bad you say? Didn’t actually notice. For my money the worst is either S1’s “Nightmares” or S6’s “Doublemeat Palace”.
Angel didn’t have a lot of really bad episodes per se but “She” is only barely redeemed by the hilarious dancing scene at the beginning. “Why We Fight” brought the season 5 story to a grinding halt so we could have Angel on a submarine in WWII. How anyone cannot love “Smile Time” is a mystery to me.
The Shield was another show that had very few bad episodes but one I really didn’t like was where Vic gets played by the hooker that was friends with Connie.
24: in the first season, Elisha Cuthbert’s girlfriend has survived being beaten and tortured by the bad guys and being hit by a car. She goes through a long surgery and just as we’re starting to think she’s going to be ok, a bad guy comes in and suffocates her. That was friggin’ harsh.
Also on 24, in the seventh season a dozen commandos from Africa take over the White House in about five minutes. This is because 1) there is a nice easy access underground tunnel to a White House broom closet that the terrorists can access 2) they have sophisticated equipment to bypass the puny photoelectric beams and cameras that protect the White House and 3) no one responsible for White House security packs anything more powerful than a pistol. The President has a panic room but it’s nowhere near the Oval Office, does not have any means of communicating with the outside world and has no weapons or body armor in it but does have several canisters of explosive gas. I know 24 requires extensive suspension of disbelief but this was going way too far.
Worse than “The Unicorn and The Wasp”?
Not MMA, but professional wrestling and Star Trek were my two passions as a pre-teen and teen, and though I’m not a huge fan of either nowadays, I still follow both to some degree.
The B plot involved Delenn going through a ceremony to officially become “The One,” and Neroon was Hell bent on stopping it (by murdering her, if necessary) because he believed someone from the Warrior Caste should lead the Rangers. Marcus stops him by challenging him to a fight to the death. He almost kills Marcus, but stops himself because he realizes that even if he were The One, none of the Rangers would care about him the way they do about Delenn, so he sacrifices his honor by not killing Marcus and confessing to Delenn.
This DOES come up later, too, as when the civil war break out among the Mibari,
Neroon sacrifices himself to save Delenn, saying that his true calling was religion, not warrior.