1 Plankton (Spongebob)
Sheldon James Plankton, or simply Plankton, is a character in the Nickelodeon animated television series SpongeBob SquarePants.
Stupid? He enslaved an entire city, built a plane-tank-robot, has a computer wife.
How is that stupid? - TeamRocket747
I think he is funny but evil!
Yes, he is really stupid.
He's a good guy for me!
2 Amazing Rope Guy (Word Girl)
Not So Amazing Because He Is Always Caught - samuelMCL7
3 Baboon (Skunk Fu)
4 The Chamelion (Spider Man)
5 Magneto (X-Men)
Magneto is a fictional character appearing in American comic books published by Marvel Comics, commonly in association with the X-Men.
6 Joker (Batman)
The Joker is a fictional super villain created by Bill Finger, Bob Kane, and Jerry Robinson who first appeared in the debut issue of the comic book Batman (April 25, 1940) published by DC Comics. Credit for the Joker's creation is disputed; Kane and Robinson claimed responsibility for the Joker's design, ...read more.
Umm.. Number 2? and Magneto at number 3? This guy has to be a troll - 445956
The dumbest cartoon villain of all time
He can't think of a good plane
7 The Silver Spooner (Dial M For Monkey)
8 Pinky (Animaniacs)
He seems silly, childish.
But his sidekick Brain he tries and fails and tries again isn't that insanity?
9 Wile E. Coyote (The Looney Tunes Show)
10 Skeletor (Masters of the Universe)
Skeletor is a fictional character and the main antagonist of the Masters of the Universe franchise created by Mattel.
11 Grey Gargoyle (Iron Man)
12 GIR (Invader Zim)
Me and the squirrel are friends
Yay we’re doomed
13 Larry Snaptrap (Tuff Puppy)
14 Dr. Heinz Doofenshmirtz (Phineas and Ferb)
Dr. Heinz Doofenshmirtz is a fictional character and the main antagonist from the animated television show Phineas and Ferb. He was created by Dan Povenmire and Jeff "Swampy" Marsh, and is voiced by Povenmire.
He is so stupid, he is so dumb
15 Max (Total Drama)
16 Lord Farquad (Shrek)
17 Virminious Snaptrap (Tuff Puppy)
I'm sorry, but PLANKTON ant number 2? He's amazing! But this guy, just plain stupid.
18 Mr Bean (Fantastic Mr Fox)
19 The Hacker (Cyberchase)
I used to love this show when I was in third grade, so I don't know... but Plankton? REALLY? I love plankton! His epic failures are what make the show! He shouldn't even be on the list. Other than that I don't really know any of the other shows on the list.
Again, he is always caught - samuelMCL7
20 Penguin (Batman)
The Penguin is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman.
21 Doctor 2-Brains (Word Girl)
22 Lex Luthor (Super Man)
Alexander "Lex" Luthor is a fictional supervillain appearing in American comic books published by DC Comics.
23 Blizzard (Iron Man)
24 Ice King (Adventure Time)
The Ice King is a character in the American animated television series Adventure Time. A supposedly evil wizard capable of creating and manipulating ice and snow, he is the self-proclaimed king of the Ice Kingdom, a land of ice he claimed as his own and lives in in company of many penguins.
He's more of a good guy than a bad guy...
25 Voltar (League of Super Evil)
26 Modok (Marvel)
27 Hobgoblin (Spider Man)
The Hobgoblin is the alias of several fictional supervillains appearing in American comic books published by Marvel Comics, commonly depicted as enemies of Spider-Man.
28 Edward Bighead (Rocko's Modern Life)
29 The Hornet's (Maya The Bee)
Annoying and stuck-up, but they're not full villains. The bees and hornets simply misjudged each other. - RedTheGremlin
30 Green Goblin (Spider Man)
The Green Goblin is the alias of several fictional supervillains appearing in American comic books published by Marvel Comics, mostly those starring Spider-Man. The character first appeared in The Amazing Spider-Man #14, and since then he has become one of the characters most famous villains. He was ...read more.
ARE YOU OUT YOUR MIND!? This guy is awesome! Whoever put this guy on here is a retard. - BombBoo256
Just because he's crazy, doesn't make him stupid
HE IS SO INSANE I CANNOT BELIEVE THE IDEA OF THIS KIND OF OPINION!
31 Zim (Invader Zim)
Zim is the titular protagonist and anti-hero of the American animated series Invader Zim, created by Jhonen Vasquez for Nickelodeon.
32 Belson (Clarence)
33 Nom Nom (We Bare Bears)
34 Robin (Teen Titans GO!)
Robin, also known as Tim Drake, is a fictional superhero appearing in American comic books published by DC Comics, commonly in association with the superhero Batman.
Robin is dumb but he's not evil, unless you're talking about the episode with the Legion of Doom. - RedTheGremlin
35 Miss Simian (The Amazing World of Gumball)
36 Mr. Robinson (The Amazing World of Gumball)
37 Sal Left Thumb (The Amazing World of Gumball)