1 Invader Zim (2001-2002, 2006)
Invader Zim is an American animated television series created by Jhonen Vasquez for Nickelodeon. The series centers on an extraterrestrial named Zim from the planet Irk, and his mission to conquer Earth and enslave the human race along with his malfunctioning robot servant GIR.
Despite it's extremely short air time, it is still remembered and it's fan base is STILL growing! Really Nick? Low ratings from the target audience? It deserves to air again.
In 2006, Invader Zim revived after it got cancelled in 2002, but then it got cancelled. - Fandomstuck
Should be #1
It got cancelled after a year of its premiere and it ended 3-4 years later after its return on T.V.. I'm not a fan of this show, but I knew CartoonsGirl would love to see this on this list and I thought it ended too early. - MostTalented_BoyX
2 Batman Beyond (1999-2001)
Batman Beyond is an American animated television series developed by Bruce Timm, Paul Dini, and Alan Burnett and produced by Warner Bros.
Sorry to the fans of this show, but it's not even close on beating the successful show known as "Batman: The Animated Series". But, it was still very well done. I just love that they did a show about the future BATMAN! - MostTalented_BoyX
3 The Spectacular Spider-Man (2008-2009)
The Spectacular Spider-Man is an American animated television series based on the superhero character published by Marvel Comics and developed for television by Greg Weisman and Victor Cook.
This series was on air for only a year! I didn't get their 3rd season. Seriously, this is one of the best animated series I have ever seen! I'm begging you Marvel! Please, work with Sony and bring this show back for its third season! - MostTalented_BoyX
4 Young Justice (2010-2013)
Young Justice is an American animated television series developed by Brandon Vietti and Greg Weisman for Cartoon Network.
Do I need to explain?! - MostTalented_BoyX
5 Teen Titans (2003-2006)
Teen Titans is an American animated television series created by Glen Murakami, based on the DC Comics characters of the same name.
3 years isn't enough for an amazing show like "Teen Titans". - MostTalented_BoyX
6 The Critic (1994-1995)
Not going to lie, this is probably really close to Batman: TAS. This series wasn't bad at all! The show is extremely underrated! Too bad it ended WAY too soon. - MostTalented_BoyX
7 Clone High (2002-2003)
8 Danny Phantom (2004-2007)
Danny Phantom is an American animated series created by Butch Hartman for Nickelodeon. It was produced by Billionfold Studios and distributed in Canada by Nelvana, a Canadian animation company. The series follows a teenage boy who, after an accident with an unpredictable portal between the human world ...read more.
4 Years is still ain't enough for an awesome show like this! I'm starting to think that this series ended so that Butch can focus on The "Fairly Odd Parents". - MostTalented_BoyX
9 Green Lantern: The Animated Series (2012-2013)
It's GREEN LANTERN! Do I need to say more? - MostTalented_BoyX
10 As Told by Ginger (2000-2006)
As Told by Ginger is an American animated television series aimed at teenagers, produced by Klasky-Csupo and aired on Nickelodeon.
? Waynehead (1996-1997)
? Station Zero (1999)
11 Daria (1997-2001)
12 Detention (1999-2000)
13 Foster's Home For Imaginary Friends (2004-2009)
Foster's Home for Imaginary Friends is an American animated television series created by Craig McCracken for Cartoon Network Studios.
14 Wolverine and the X-Men (2009-2009)
Wolverine and the X-Men is a 2009 American animated series by Marvel Animation. It is the fourth of five animated adaptations of the X-Men characters, the other four being Pryde of the X-Men, X-Men: The Animated Series, X-Men: Evolution, and an anime adaptation known simply as X-Men.
I was never a fan of the show. Neither of the "X-Men" franchise. But It seems very interesting and maybe when I got time in the future, I'll probably watch a couple of episodes of this show. - MostTalented_BoyX
15 My Life as a Teenage Robot (2003-2007)
My Life as a Teenage Robot is an American animated science fantasy television series created by Rob Renzetti for Nickelodeon.
16 Whatever Happened to... Robot Jones? (2002-2004)
17 Futurama (1999-2003, 2008-2013)
Futurama is an American animated science fiction sitcom created by Matt Groening for the Fox Broadcasting Company.
It received a cancellation then it returned to Comedy Central and then it got ended! That just proves how some networks can't handle their shows properly. That's just my opinion - MostTalented_BoyX
18 T.U.F.F. Puppy (2010-2015)
T.U.F.F. Puppy is a cartoon created by Butch Hartman. It ran on Nickelodeon from October 2, 2010 until April 4, 2015. It focused on Dudley Puppy and his partner Kitty Katswell as they protected Petropolis under the Turbo Undercover Fighting Force, or T.U.F.F.
19 Rocko's Modern Life (1993-1996)
Rocko's Modern Life is an American animated television series created by Joe Murray for Nickelodeon. The series centers on the surreal life of an anthropomorphic Australian-immigrant wallaby named Rocko as well as his friends: the gluttonous steer Heffer, the neurotic turtle Filburt, and Rocko's faithful ...read more.
20 Robot and Monster (2012)
21 Time Squad (2001-2003)
22 Todd McFarlane's Spawn (1997-1999)
23 Earthworm Jim (1995-1996)
24 The X's (2005-2006)
25 Gravity Falls (2012-2016)
It only lasted 4 years because of all the hiatus'. If that didn't happen, the run would be way shorter. :c - Rue