"One + One = Ed" is the 4th episode of Season 2 and the 30th episode of Ed, Edd n Eddy. In this episode, the Eds embark on a learning spree, disassembling various objects and eventually stumbling into a bizarre universe that defies the laws of physics.
Eddy is shown happily asleep at night but wakes up to see Ed lying next to him in bed, asking how his feet can smell without a nose. Eddy yells at him to go home, but Ed asks a number of other useless questions to Eddy and eventually taking Eddy with him to the kitchen. While Eddy tries to get some sleep, Ed stays up all night opening and closing the fridge to figure out if the little light in the refrigerator stays on if the fridge is closed. In the morning, Eddy appears very sleep deprived. After failing to convince Ed to think of more useful questions, they visit Edd at his house and find him disassembling an old radio. Eddy then has an idea to get rich by learning and taking things apart.
They leave Edd's house and go to Ed's garage where they find a mountain of items. Ed takes apart a washing machine that he dumped on Eddy, finding one Eddy and a whole bunch of "doohickies" inside. After going though some other items in the garage, they decide to go somewhere else to learn more. They go to Rolf's house and disassemble a chicken pen. While Rolf tells them a story from his homeland, Ed takes hold of a tree and turns it, making it flat. Edd and Eddy examine the tree before leaving Rolf's house as its owner shouts that life has many doors.
It doesn't take long for Eddy to find his way behind the silhouetted houses in the backdrop. While Edd rambles about what's happening, Ed slides under the asphalt (which adapts fabric-like qualities), and Eddy crushes a house by jumping onto it. Eddy wants to take a break since the learning is making him hungry, but then he sees his hand go through the sun. He proceeds to eat the sun, causing it to become the moon and the cul-de-sac to become shrouded in nighttime. The Eds find Jimmy, scared by the sudden loss of daylight. Eddy pulls Jimmy's shirt apart by a loose thread, removing his outline in the process and causing him to melt away. Eddy then rearranges the outline and creates a new hairdo for his head. Ed is then shown sawing the sky and finds the Kankers in a bathtub. He pushes them away and Eddy then walks into the hole that fell on the ground and falls into it. Eddy then falls into the hole endlessly until Ed removes the hole from the ground. He then puts his head in the hole to see where it goes to, appearing up in the sky before he takes his head away from the hole. After seeing this, Edd notes that they are close to answering that all important question. Suddenly, Sarah appears from the rolled-up hole in Ed's hands, angry at what Eddy did to Jimmy, but Eddy gets rid of her with the help of some cartoon physics (by running fast in place and then stepping out of his spinning feet animation and placing Sarah on it causing her to run off very fast to places unknown).
Edd soon becomes excited over their discoveries, thinking they could make an appearance on the cover of "Intellectual Discoveries' Magazine". Eddy notes it is a good thing that Edd is housebroken. Edd then looks up and sees a cow floating in midair. Edd now becomes uncomfortable and walks away with Ed and Eddy following him. The boys are now in the midst of a realm where nothing is bound by Earthly limitations.
Sarah then comes out of a small house and claims that everything is broken and she wants Eddy to fix it now. Eddy tells Sarah to shut her mouth before deciding to physically remove her mouth. Eddy states he loves taking things apart, only for Sarah's mouth to start biting him. After Eddy asks Edd to get her biting-mouth off of him, the Eds disappear into an original scene transition that looks like a checkerboard. The Eds then appear in Kevin's eye, materialize from his bike's dust cloud, meet Jonny who has Plank for a head and is carrying his own head around, Nazz who has a large body of a purple reptile, briefly experience levitation, and Rolf with three heads coming from behind the wall revealing static.
The Eds escape after Ed inflates a cloud. They then start to ponder what to make of what they've discovered, but the cloud is popped from above by a pencil. The notepad is dropped, they hit the ground, and soon start grabbing the scattered notes.
Edd and Eddy realize that their setting is back to normal, but Ed seems to still think he can take off Jimmy's outline, Sarah's mouth, pick up holes, etc. The episode ends with Ed being pursued by Sarah, while carrying a sewer pipe which Edd and Eddy fell into.
When Eddy kicks Ed out of his bed, Eddy has four toes instead of three.
Edd disassembles the radio from behind. When Eddy picks it up, it appears to have been opened from the bottom.
When the Eds take apart Rolf's chicken coop, Ed's body cannot be seen through the mesh door.
Rolf's teeth are white instead of green when he exclaims, "Life has many doors, Ed-boys!"
When Eddy removes Jimmy's outline, his retainer outline is still on his body.
When Eddy places Jimmy's outline in front of Edd, the red stripe on Eddy's shirt disappears.
Near the end, Jimmy says "Can't we all just get along?" This is a reference to Rodney King, and his famous public statement during the riots following his trial.
In this episode, Edd is shown to be ambidextrous, as he can be seen writing with both hands. This could, however, just be a goof.
After encountering Jonny and Plank, Edd says "This is not good." Ed originally said this line in "Nagged to Ed."
When Rolf pulls Wilfred out of the chicken coop, he says "Do not burn the candle at both ends, as it leads to the life of a hairdresser." This statement is contradicted in the episode "Take This Ed and Shove It," where Rolf reveals that he wishes to be a barber. There, he explains that "In the Old Country, he who cuts hair is a man among men."
A popular meme format was created from Rolf's quote, "Life has many doors, Ed-boys!" The image that comprises this meme is a screenshot of Rolf opening a hole, revealing the static.
"Where's the cash?!?" – Eddy Please consider downloading this episode of the show in high definition from iTunes in order to support the creators' hard work.