Butterfly Effect

"Butterfly Effect" is the twenty-first episode of The Loud House.

Plot
After spilling an experiment of Lisa's, Lincoln sets off a chain reaction that unravels the household.

Synopsis
Lincoln is practicing his yo-yo tricks when his yo-yo flies off his finger and into Lisa's potions, breaking the bottles and spilling their contents. Fearing how angry Lisa might be when she finds out what he did, Lincoln decides not to tell her who did it, asking "What's the worst that can happen?", and removes the evidence from the scene. Afterward, a stray drop from one of Lisa's formulas causes an explosion that blows a hole that exposes Lori and Leni's closet.

While overseeing the damage, Lori finds a signed photo of Bobby on Leni's side of the closet, which Leni claims was her "88-day-iversary" gift that she forgot to give to her, and Lori assumes the two had been dating each other behind her back. After Lori storms out of the room, the coat rack in the closet falls on Leni's head, knocking her unconscious. When she awakens, Lincoln and Lisa discover that the concussion had made Leni even smarter than Lisa. Feeling that her world has been shattered, Lisa gives up on science and gets a job as a gas station attendant at Flip's Food & Fuel.

Later, Lynn comes home, enraged that she got kicked off from every sports team because she's failing school (since Lisa no longer tutors her), and angrily kicks her soccer ball, which hits Lola in the face. Lola gets a hideously swollen nose from the hit, and Lola proclaims that she looks like a "monster". When Lincoln tries to encourage Lola not to say that, Lola runs back upstairs in despair, accidentally tripping on the last step, causing her to fall face first on the floor and lose all but one of her teeth. Lincoln tries to convince Lisa to come back, but she refuses, especially when Leni shows up saying that she won the Nobel Prize for inventing a car fueled by apple juice.

Back home, Lola has decided to run away to avoid being reminded of her former beauty, while Lana, not wanting to suffer like her, decides to walk around in a plastic bubble for her own protection. Meanwhile, Luna records a music video she wrote about her family falling apart, and it becomes so successful that Mick Swagger recruits her to join his tour. Lincoln tries to call Clyde to help him fix the insanity he caused, but he can't because now, since Lori broke up with Bobby, she's dating him for the rebound and they are skydiving together. Luan enters Lincoln's room, and announces that she's giving up comedy and becoming an activist, due to watching too much cable news. She has also liberated all of Lana's pets, and they are running wild throughout the house.

While trying to subdue the rampaging animals, Lincoln watches several reports on the news detailing the fates of his sisters; Luna has been kicked off the Mick Swagger tour after destroying her hotel room in a rage, Luan has chained herself to a giant redwood tree, and Lynn and Lola are on the lam after robbing the gas station Lisa works at. Lucy appears, announcing to Lincoln that she is now a vampire from being bitten by Lana's liberated bat, and she turns into one herself. At his wit's end, Lincoln figures that he still has to save his remaining sister, Lily, only to find that she's not in her crib. Instead, Lisa's spilled chemicals have caused her to grow into a giant, and she lifts up the roof so she can grab Lincoln and devour him.

Suddenly, everything cuts back to before Lincoln removed the evidence, revealing all the chaos was only Lincoln imagining a worst-case scenario for not telling Lisa. Lisa enters the room, and Lincoln confesses that he ruined her experiment. However, instead of being angry Lisa is ecstatic, because Lincoln inadvertently proved that he was the one variable in her highly-controlled experiment. Lincoln is relieved that things are normal in the house, only to see, to his horror, Lori and Clyde riding by on a bicycle, apparently having gotten married, ending the episode.

Cast
Mr. Coconuts has no lines in this segment.
 * Grant Palmer as Lincoln
 * Catherine Taber as Lori / Reporter
 * Liliana Mumy as Leni
 * Nika Futterman as Luna
 * Cristina Pucelli as Luan
 * Jessica DiCicco as Lynn / Lucy
 * Grey Griffin as Lana / Lola / Lily
 * Lara Jill Miller as Lisa
 * Caleel Harris as Clyde
 * John DiMaggio as Flip / News Anchor
 * Jeff Bennett as Mick Swagger

Trivia

 * This episode marks the only time Lola cries outside of "The Green House".
 * Lisa tutors Lynn so that she can stay on her sports teams.
 * Lincoln's bike is the same hand-me-down that Lynn gave him in "Hand-Me-Downer"; which is strange as he gave it to Lana.
 * Leni drives a car which means she passed her driving test. However because this is only in Lincoln's fantasy it's unknown if she actually has one in real life, or if it was just part of Lincoln's fantasy.
 * Charles appears to be very intelligent due to the fact that he can use a phone.
 * Another strange fact is that Lincoln can understand whatever Charles can say.
 * When Clyde texts Lincoln a picture of he and Lori skydiving, he has a flip phone which is strange since in "Sound of Silence", "Two Boys and a Baby", and "Cover Girls" he has a smartphone.
 * At the end of the segment, Clyde and Lori are riding the tandem bicycle from "Hand-Me-Downer".
 * The order in which something negative happens to Lincoln's sisters within his fantasy:


 * Lori - Disowns Leni, dumps Bobby, and falls in love with Clyde.
 * Leni - Becomes smarter than Lisa after being hit in the head with a coat rack, becoming extremely arrogant and uncaring in the process, and abandons her family to go to Harvard after winning a Nobel Prize.
 * Lisa - Gives up her studies and gets a job at Flip's Food & Fuel.
 * Lynn - Gets kicked off her sports teams for failing her academics, leading her to run away with Lola into a life of crime.
 * Lola - Gets hit in the face with Lynn's soccer ball and runs away with Lynn to a life of crime after repeatedly injuring herself to the point where she believes she's a hideous monster.
 * Lana - Protects herself inside a plastic bubble to avoid any injuries.
 * Luna - Joins Mick Swagger on a world tour, only to get kicked off for trashing her hotel room.
 * Luan - Gives up comedy and becomes an activist after watching too much cable news.
 * Lucy - Turns into a vampire after being bitten by Lana's liberated bat.
 * Lily - Becomes a giant after being exposed to Lisa's chemicals.

Running Gags

 * Lola repeatedly getting injuries on her face.
 * Charles trying to make Lincoln confess to Lisa about his accident.
 * Something happening to one of Lincoln's sisters.

Clip
El Efecto Mariposa