Butterfly Effect

"Butterfly Effect" is an 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 then proceeds to trip and lose all but one turning her teeth, making her into a "hideous monster". 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 go subdue the rampaging animals, Lincoln watches several reports on the news detailing the fates of his sisters; Luna has been kicked off the 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 imaging 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.

Cast

 * 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 Lola / Lana / Lily
 * Lara Jill Miller as Lisa
 * Caleel Harris as Clyde
 * John DiMaggio as Flip / News Anchor
 * Jeff Bennett as Mick Swagger

Trivia

 * Lisa tutors Lynn so that she can stay on her sports teams.
 * Lynn's sports teams require good grades for someone to stay in them.

Running Gags

 * Lola repeatedly getting injured on her face.
 * Charles trying to make Lincoln confess to Lisa about his accident.