"Thick as an Ed" is the 15th episode of Season 4 and the 92nd episode of Ed, Edd n Eddy. In this episode, Ed's lucky chunk of cheese, Sheldon, starts creating big arguments between Ed and Edd due to Edd being unable to stand Sheldon's stench. Eddy must now find a way to stop the arguments so that he can finally create his latest scam, a frog jumping derby.
Ed is sleeping soundly when loud yells from his sister awaken him, reminding him that he has to take her to Jimmy's house at this moment. Ed manages to get up and drag himself to the door, but he's still half-asleep and is unable to tie his shoes, so Sarah decides to go by herself. This is just as well when it comes to Ed, as Ed has fallen asleep again and is dreaming of wonderful worlds.
Ed's restful state is soon broken by Eddy, however, as Eddy has a new scheme in mind. This scheme is the Triple-E Frog Jumping Derby, during which the kids will pay to jump frogs in a race. Edd has, of course, done the research and procured the necessary implements. Unfortunately, one of these implements is goggles, and Ed naturally has a hard time getting them to fit; when Edd comes over to try and help, he is instantly driven back by a horrid scent and runs off. Eddy is confused by this sudden twist, but when Ed leans on him, he discovers that this isn't Ed's usual stink: This time he really honks. Eddy shoves Ed off him as Edd comes back with a fly and a string so they can find out what exactly is causing the odor. When the fly dies outside Ed's jacket pocket, Edd demands to know what's inside, and Ed pulls out a greenish cheese chunk that he says is lucky and has named "Sheldon". While Edd is ready to leave when he hears about this, Eddy stops him, saying that it's time to get to work.
When they make it to the Creek, though, they merely run into more problems. While Edd is fixated on getting the cheese away from Ed, Ed is oblivious to his friend's problem. Of course, Edd will not stand for such filth, and he delivers an ultimatum that Ed get rid of his jacket. This leads him into unfamiliar territory, however, as Ed requests in kind that Edd gives him his hat. An angry feud starts between them, and when Eddy finally quells it, the two refuse to talk to each other. Fed up, Eddy makes up a story about Ed needing a disguise to fool the frogs, and Ed buys it.
Ed is then seen seated on a lily pad wearing a makeshift bikini and flippers, as a gambit to entice frogs. While Ed is distracted in this manner, Edd is able to remove the cheese from the abandoned jacket and seal it away in a jar. Ed notices something amiss, however, and he soon retrieves the cheese from the jar and puts it back in his pocket. Good and fed up with how the scam seems to fail the instant they make any progress whatsoever, Eddy tries to take Ed's jacket. When this doesn't work, he falls to scheming, and after an unfortunate dip in the river, suggests that he could use something to dry him off. Ed has come prepared with a towel, however, and Eddy thinks of something zanier: the Eds will start their own country, and Ed can be the grand poobah of zombies. All they need to do is use Ed's jacket as a flag. Enticed by the promise of a zombie army, Ed gladly gives Eddy his jacket, and Eddy ties it to the top of a tree, where no stench can permeate to the ground below.
It finally looks as though some work will get done when Sheldon falls out of Ed's jacket and plummets, hitting Edd dead on. Ed notices his cheese and picks it up, but by this time Eddy is sick of dealing with his friend's lucky cheese, and in his rage, he simply throws it into the creek. Ed looks unhappy at this as he starts to cry, though, and despite his glee Edd feels a need to comfort his friend, and offers up a lucky handkerchief. Eddy is angry with this talk of luck, but it seems that there's no way to escape it, as Ed happens to keep another lucky charm: Angus, his lucky fish skeleton. This obviously drives Edd to distraction, and once again a debate starts up, with Edd demanding the removal of the fish and Ed demanding that Edd give him his hat.
Goof: After chasing Ed and falling into the water, Eddy was soaking wet. Seconds later, Eddy is completely dry.
It is possible that Sheldon the lucky cheese chunk receives it's name from the head of AKA's overseas animation, Sheldon Arnst. In addition, Angus, the more-than-lucky fishy, could receive it's name from AKA's inker, Angus Bungay.