Development hell

Development hell, also known as development limbo, is a term used to describe works of media, specifically TV shows/episodes, that remain in development for an especially long time and thus have not yet progressed to production.

Rushing of TV production is the opposite problem, where a show/episode is rushed into production to coincide with a holiday or another event, which causes the show/episode to be unfinished and garner negative reception.

There's an article similar to this on Crappy Games Wiki & Awful Movies Wiki.

Examples

 * 1) Starter Squad: While a good show, it had times of development hell. For example, Episode 10 was being made since 2019, it was originally supposed to be released in 2020, but later got delayed to 2021 (Most of the time is being spent on realistic snow effects). As of October 23, 2021, with the episode being released, and had good reception from viewers.
 * 2) The Flintstones (Seth MacFarlane version): A series reboot of the Flintstones produced by Seth MacFarlane was announced in 2011, set to air on FOX, but due to MacFarlane's busy schedule, the premiere kept delaying before being cancelled when FOX's rights to the Flintstones were sold back to Warner Bros. MacFarlane later admitted that he couldn't find a way to differentiate a modern-day Fred Flintstone and Peter Griffin.
 * 3) Close Enough: This animated series by Regular Show creator J.G. Quintel was originally slated to air on TBS in 2018 alongside another animated show, The Cops, starring Albert Brooks and Louis C.K.. However, The Cops was cancelled in light of Louis C.K.'s sexual misconduct allegations, and Close Enough ended up getting delayed to 2020, when it became an HBO Max original series.
 * 4) High Guardian Spice: This Crunchyroll original series was meant to premiere in late 2019, but due to the first trailer's negative feedback, the show was delayed for two years with barely any news in the intervening time until quietly appearing on the service on October 26th, 2021.
 * 5) Kung Fu Spy Troll: An animated series created by Butch Hartman featuring mutant animals was archived via a Nickelodeon website snapshot at Wayback Machine, but no other information for the series exists outside of a description. It is widely speculated that this series was retooled into T.U.F.F. Puppy.
 * 6) Crash Nebula: An animated series created by Butch Hartman and Steve Marmel based on the in-universe TV show of the same name from the Fairly OddParents. A pilot episode was made with the beginning and end segments featuring Timmy and his fairies playing the guessing game on what the current Crash Nebula episode is airing at the moment, only for Timmy to miss said episode once he finally gives the answer to the fairies at the end. No further progress was made on the Crash Nebula series due to Hartman and Marmel already working on Danny Phantom at the time.
 * 7) Power Rider: This Tokusatsu show would've been Saban Brands' second attempt at a Kamen Rider adaptation after the disastrous Black RX adaptation known as Saban's Masked Rider. It's title is a name mashup between Power Rangers and Kamen Rider. Information about this show is currently unknown, though was rumored to be an adaptation of either Kamen Rider Decade or Kamen Rider W. The show kept getting delayed until Haim Saban lost interest in it and decided to abandon the idea. Though with Hasbro now owning the Power Rangers franchise, it is possible that they could bring back the idea of a Kamen Rider adaptation.
 * 8) IDFB (Island Dream For Battle): While an improvement over BFDIA for the most part, the season as of now has only one episode, released in September 1, 2016, but was then followed up by BFB in November 3, 2017. Despite that, the season has not been officially confirmed that it was cancelled, and a second episode may eventually happen. It hasn't. Fast forward to today, and it was likely put in indefinite hold.