CatDog – Two half-hour episodes have still never seen the light of day on U.S. television. However, they have been released through DVD and on digital platforms (like Amazon Instant Video).
•Noah Knows Best – As noted above, five episodes remain unaired and are likely never going to be shown or released.
•As Told By Ginger – Eight half-hours remain unaired on U.S. television. Those include five high-school centered episodes and a 90-minute movie finale. That movie (“The Wedding Frame”) was released on DVD in 2004, but the other five episodes have not been. They all have aired for certain in other countries, including on Nick Canada just this past month.
•The X’s – Strangely, one episode (“Theater of War / Breaking Camp”) of this one-season wonder never aired on Nick or Nicktoons. It did in international markets.
•My Family’s Got GUTS – A second season of 12 episodes never aired in America, while it has at least aired in Australia.
•The Penguins of Madagascar – Nick still sits on four-and-a-half half-hours of this series. It aired in reruns on Nicktoons up to this past month, but these episodes, which include a much-touted at the time Big Time Rush voice-over episode as well as a Conan O’Brien-voiced episode, still haven’t aired. As is the case with others, these episodes have aired internationally.
•T.U.F.F. Puppy – Here’s a case where Nick over-ordered episodes on a show they had no intentions of airing to completion. 35 episodes aired on Nick before the network switched it over to Nicktoons last fall, where it has aired 18 episodes. Seven half-hours from season three are still waiting to be shown.
•Winx Club – Nick hasn’t aired 18 episodes from season six. Eight of them did air on Nick.com for a short time this May, but they haven’t been seen on TV yet. Though, Nick US looks to be done with this show altogether.
•You Gotta See This – Nick made 20 episodes of this hosted clip series but only aired eight on the main network in 2012, four on Nicktoons this past April Fools Day, and sits on eight episodes left to be aired.
•Robot and Monster – After Nick waited so long to finally premiere this show, then blasted new episodes out so quick in the second half of 2012, there are two half-hours still waiting to be seen. The show airs daily on Nicktoons, so I’m not sure what they’re waiting for. Two other unaired-on-Nick half-hours did premiere on Nicktoons in the past year, so there’s hope.
•Kung Fu Panda: Legends of Awesomeness – While still recent, it’s only a matter of time before this series falls into this list like the others. 10 episodes remain to air and the main Nick channel doesn’t air it at all currently, while Nicktoons airs the show multiple times every day.
•Webheads – 18 episodes of this summer’s short-lived game show remain to be seen.
Of course Nick has also waited a length of time between when a series was at its prime to a time where no one cared, to finally air episodes – either on the main network, Nicktoons or TeenNick. Those include:
•The Ren & Stimpy Show – This show has its own sorted history, but it’s safe to say a number of episodes never aired on Nickelodeon, Nicktoons or TeenNick. Why? Content. “Man’s Best Friend” is the best example of this. I’m honestly not versed in Ren & Stimpy history as well as some others are, but some episodes did end up airing for the first time on MTV, Spike TV or were seen through the show’s DVD release.
•The Angry Beavers – At least six episodes aired on Nicktoons only in 2006, and have since been release on DVD.
•All Grown Up – A gap of two years went between major chunks of episodes before Nick blasted 14 unaired episodes out on weekday mornings in 2007 and aired the final three in summer 2008.
•Invader ZIM – Like Ren & Stimpy, ZIM had a sorted history with the network – albeit shorter. Six-and-a-half half-hour episodes didn’t originally air on Nick during the shows 2001-2002 run. They were first released on DVD in 2004 and ended up premiering on TV in 2006 on Nicktoons Network. Many episodes also went unfinished in production, with seven of them having audio recordings available on the 2004 DVD sets.
•ChalkZone – Three years passed by before Nick aired the last six episodes in summer 2008 during the 6am hour.
•My Life as a Teenage Robot – A whole season of 12 episodes waited three years to finally rollout first on Nicktoons in 2008. Nick did air 11 of them the day after their Nicktoons debut, but for some reason didn’t bother to air the last episode.
•Mr. Meaty – They waited more than a year after Nick aired its last new episode before the final eight episodes aired on Nicktoons.
•Back at the Barnyard – Five-and-a-half episodes aired on Nicktoons a year after Nick gave up on it.
•The Mighty B! – A massive 13.5 episodes ended up airing on Nicktoons only, after Nick no longer cared for it.
•Making Fiends – This show was originally intended for Nick but was buried on Nicktoons for its short 6 episodes.
•Rugrats: Pre-School Daze – These four half-hour specials aired in 2008 on Nick during the early weekend mornings, despite the fact that they were produced and first released on DVD sets years before.
•Random! Cartoons – Like Making Fiends, this was pushed to Nicktoons-only where it premiered its 13 episodes.
•The Troop – Over a year after Nick stopped airing the show, the final seven episodes aired on Nicktoons, four in October 2012 and three in May 2013.
•BrainSurge – Nick waited almost three years to air the final 10 episodes of the “Family BrainSurge” season this past May on Nicktoons.
•Fanboy & Chum Chum – A large 15 episodes were burned out on weekday mornings before one last episode went unaired for two years, before finally airing this past summer on Nicktoons.
•Planet Sheen – Only 10.5 of Sheen’s 26 episodes ever aired on Nick, before it was shifted to Nicktoons in 2012 for the rest of its run.
•Bucket & Skinner’s Epic Adventures – Eight episodes were never aired on Nick but finally aired in spring 2013 on TeenNick.
•The Legend of Korra – We all know the travesty done to this excellent series, but at least it has been seen online and hopefully will finish airing on Nicktoons as well.
One thing is sure clear. Watch Nickelodeon (main channel) at your own risk. They make it so damn impossible to watch ANYTHING. This is why I’m sticking with Nicktoons (the channel). I had no idea about any of this personally.