Television

so specific genre, shows that have to use "famous" hollywood actors as a shoehorn for the show ruiend the show.

SPN for example had to shoehorn to less than so-so actors for the shows, kripke dint want in the first 5 season(adam) and later jack in the last few season.

picard was super problematic from s1-s3, and thier attempt including all the old cast was cringey at best, plus they tried to shoehorn changelings again for some reason.

isaip, not so much as a introduction, but a change in the way they were written it was clear by later season the cast were not writing anymore(and they have largely given up on the show), and they had to shoe horn things like metoo movement, and very vain issues of socoeital issues. and the actors themselves, aside from charlie and danny devito had become pretty shallow people both in the show and irl(thier PLASTIC surgery binge and obsession with being with the elite circles of hollywood made show unwatchable past season 13.

Cheers wasn't the same after Kirstie Alley's Rebecca replaced Diane...

When I was a kid, I don't think I kept watching Rugrats for very much longer after they added Dil.

Parks and Rec. They spend like a whole season trying to convince you that April hated Andy forever and it just didn't need to go on that long. They are way funnier as a couple for the rest of the show and they could have just gotten there in an episode two instead of wasting a whole season with her dating that Spanish guy that Andy ends up playing music with anyway.

Even on rewatches those scenes just feel forced and stupid. Still love the show though.

No

Rory (Lucifer's daughter) from the future on the TV show Lucifer. The time travel plot line felt pretty forced.

Neelix made me eventually quit watching Star Trek Voyager. Too much cringe.

The Walking Dead. There was a season premiere where Negan became more prominent and just kills off a main character and there was no point to it. That’s when I shut it off mid episode and never watched it again.

Connor on Angel. His arc was pretty damn painful to sit though, and lasted nearly two seasons.

I'm not going to say "Ruined", but Farscape was significantly degraded by the introduction of Grazer.

Scorpius is one of the greatest antagonists ever written for a TV show. I don't think what they chose to do with him was a terrible idea, it's good to shake things up. But as a replacement as the primary antagonist, Grazer absolutely sucks. The fact that they literally gave her mind control sex pheromones that she spreads from her boobs genuinely sounds like the sort of thing that belongs in a bad porn parody. Like, that is "Horny fourteen year old" levels of bad writing.

Thankfully the one season she's a big deal for is still perfectly enjoyable, and the show sticks the landing pretty decently with Peacekeeper Wars, so don't let this deter anyone from giving it a look. Like all nineties and noughties TV, it's got a lot of ups and downs, but all in all its a really fun show.

Izumi in Gantz he was the problem and also the symptom. That became a shitshow for posterity. What the fuck were those vampires man!
Sheldon in the Big bang theory I know he comes in episode 1 but how the fuck anyone puts up with his shirt? The show for real should have been Leonard saying "why I have to tolerate you?" And gtfo that apartment. I know Sheldon is used as a device to generate stories but man... Could you not just do a nerd stereotypes list of a character?

The lincoln lawyer tv show

Introduction of Cisco ruined it.

Guy is supposed to be a big macho hunk biker and was some sweaty mom's basement dewler... we had to turn it off and never went back.

Near from death note. Man what a fucking downgrade.

Friends when they added Paul Rudd