"Ed in a Halfshell" is the 21st episode of Season 2 and the 47th episode of Ed, Edd n Eddy. In this episode, Sarah has Ed take care of Jimmy while she is at her ballet lesson. Later after seeing how much bonding two people do together, Eddy takes Jimmy under his wing as a temporary apprentice and tries to make Jimmy a scammer like himself.
The Eds are busy setting up their new scam "Gerbil For A Day" (Ed being the gerbil). The scam is a failure, as there are no willing customers, and Sarah shows up. She makes the Eds play with Jimmy while she's at her ballet lesson so he will have someone to play with (also threatening Ed that she would break his model rocket in two if he didn't). She gives Jimmy a whistle in case The Eds cause him trouble, and she will come to his aid. The Eds decide to play games, much to the misery of weaklings Jimmy and Edd, so Eddy chooses dodgeball. After causing Ed pain, Eddy turns his attention to Edd, who flashbacks to the torment of gym class and a mysterious "dodgeball incident". This memory frightens Edd so hard that he (along with Jimmy) breaks down into anguished tears of fear. After that calamity, Jimmy decides it's his turn. Eddy says "No way!" to this since he claims it is still his turn. Jimmy is about to whistle for Sarah when Ed pleads Jimmy to not to since "Sarah's bad for Ed!". He then lands on Eddy while telling him not to hog the ball as well as saying to let Jimmy have a turn. Jimmy is happy that he gets a turn and to make it easier for Eddy to stay in position, Ed then rubs Eddy's shirt on his head a few times before sticking him to the garage door like a magnet. After Ed gives Jimmy the ball, Edd notes that the position is way too far for Jimmy and asks him to move Jimmy closer. Ed brings Jimmy closer and says to him it is his turn to hurt Eddy. Eddy mocks Jimmy that he will not hit him that hard, but this proves to be a mistake as Jimmy is incredibly angered by this, hitting Eddy so hard with the ball that Eddy falls through the garage door. Ed and Jimmy celebrate, with Ed acting like an older brother with Jimmy mimicking him.
Eddy (after Edd explains the reason Jimmy's copying Ed to him) decides to mold him into a master scammer. After a series of tests, which involve things like manipulation of Ed in to doing the heavy lifting and throwing eggs at a picture of Sarah (and Ed and Edd), it's time for Jimmy's first scam. Jimmy goes for a trampoline scam, which is more successful than any of Eddy's previous scams (and Edd even admits that he would never have thought of making a trampoline from the materials that Jimmy used, to which Jimmy replies smugly that it was obvious he wouldn't, making Edd angry). Eddy tries to take 50% of his profits, but Jimmy decides not to share with his teacher.
Eddy attacks him and they fight. Becoming danger-prone, Ed blows the whistle that Sarah gave Jimmy. Edd tries to warn him about it, but is too late. The boys keep going until Sarah arrives crashing. Jimmy tries to look as pathetic as possible, rubbing dirt in his own eyes. Sarah promptly shoves Eddy and Edd down Ed's throat and through his ears, then she and Jimmy leave for the candy store. Edd remarks that Eddy truly created a monster and Eddy replies that it makes him feel all warm inside. Ed tries to say something, but can't so Edd says to not talk with his mouth full.
Eddy: [promoting] "Whaddya think, Kev? Gerbil for a day! Only 25 cents for 25 seconds and we'll throw in this free salt lick. Limited quantity - better move fast." Kevin: [taking salt lick] "Let's check it out." Eddy: "Watch it! Those sweaty hands may leave marks."
Sarah:[sweetly] "Oh, Ed?" Ed:[quivering in fear] "Uh, yes, oh obnoxious little sister of mine?" Sarah: [holds up a model rocket] "See what I got?" Ed:[very upset] "THAT IS MY 1/32 SCALE ORBITAL PLANET RE-TRACKER NUMBER 2 MODEL ROCKET!" Sarah:[threateningly] "Take care of Jimmy or I'll pulverize your stupid model!"
Edd: [horrified at Eddy's suggestion they play dodgeball] "Eddy! Wait! Dodgeball has no educational value whatsoever." Eddy: "Whaddya talking about? It builds character – puts hair on your chest." Jimmy: "Hairy chests are so Neanderthal."
Edd: [quaking in terror as Eddy aims the ball] "Eddy! Wait! I have a history with this game." [gulps] "I see flashes, Eddy. Deep rooted images … tentacles … strangulating every rational nerve. Oh! I'm reliving it, Eddy! Eddy: [draws face on ball] "But it's got your face on it, Double D." Edd: "Listen to me, Eddy! Eddy? It's gym class all over again!"
Ed: "There Jimmy, your turn to hurt Eddy." Eddy: [sarcastically talking about Jimmy inflicting pain on him] "Oh! This guy's gonna murder me! Somebody please save me!"
Eddy: [dreaming of how Jimmy can be "bettered" into Eddy #2 and thus double the income] "A mirror image, one exactly like the other, two peas in a pod, two humps on a camel, a dynamic duo, a pair of underwear-" Edd: "A pair of underwear is one item, Eddy." Eddy: "Same thing."
Edd: "Hurry, Ed." Ed: "Shhh. My yeast is rising." Edd: [pause] "Nut loaf, Ed?"
Rolf: "Kevin is good at wienering, yes?" Kevin: "That's hotdoggin', Rolf." Jimmy: [timer rings] "Time's up, Kevin." Kevin: [jumps off the trampoline] "That could've been more than 25 seconds!" Jimmy: "Take it to the back of the line, bub!" [Kevin walks to the back of the line of Jimmy's scam] "OK! Cough up the dough Rolfie-Boy."
Rolf: [to Jimmy] "Has anyone ever told you your hair resembles the backside of a chicken?"
Eddy: [enraged by Jimmy's refusal to share the cash] "You thankless little… if it wasn't for me you'd be planting posies!" Jimmy: "Tell it to the judge!" Eddy: "Oh, he's good."
Ed stuck Eddy to the garage door with static electricity, yet Ed didn't know about static electricity until season 5's "Every Which Way But Ed." However, as Ed isn't very brainy, he may have forgotten about how static electricity works between this episode and "Every Which Way But Ed."
When Eddy gave a wedgie to Jimmy with one egg, two yolks came out.
However, once in a while an egg will actually contain two yolks, so this may or may not have been intentional.
When Jimmy was going to do his second try at throwing eggs at Sarah's picture, Eddy gave him three eggs, but when Jimmy hit Ed and Edd, there were more than three eggs thrown at them.
When Ed said "Shoosh-a, Shush-a!", his mouth didn't move. However, he put his finger on his lips.
If one was to listen closely, they would hear Ed wet himself while in the gerbil costume.
This episode marks the first allusion to the mysterious "Dodgeball Incident" associated with Edd.
This is one of the few episodes that Jimmy calls Sarah for help whenever the Eds are threatening him. In this episode, the key to bringing Sarah to beat up the Eds is the whistle.