The story opens with Lincoln playing on his virtual video game headset, which is about beating zombies by break dancing. While he was dancing throughout the hallways, he stumbles into Lori's room. Lori angrily says his name and he removes the goggles to reveal that he accidentally stumbled into her room. She berates him for being in her room, tells him to stay out and if she catches him in her room again, she'll turn him into a human pretzel. While she talks to Bobby, she harshly kicks him out, much to Lincoln's annoyance.
Lincoln angrily resumes his game and dances his way to the bathroom, and while he uses the toilet he puts his headset on the sink. Lori knocks on the door, Lincoln tells her he's occupied, and she begins to pound the door. Frustrated, he opens the door, Lori is still talking to Bobby and, not paying attention, accidentally shuts Lincoln out of the bathroom. He angrily storms into his room, only to realize he forgot his game. He bolts out of the door to see the twins Lana and Lola with sunglasses, orange sashes, and belts. They tell him that they became the new hall monitors at school and they're practicing at home. They give him a ticket, telling him that if they see him running again, they will send him to jail, they've already locked up Luan (the jail is cardboard) for telling bad jokes. She tells one, only to get 5 minutes more. Lincoln agrees and the twins shut themselves in their room. He runs to the bathroom to see his headset broken because Lori stepped on them. Enraged, Lincoln runs outside to complain to Lori, but she drove off in the van so he calls her a dirtbag.
In his room, Lincoln angrily laments to Clyde about his game being broken. He tosses the damaged goggles and Clyde catches them, only to fall off Lincoln's bed. Clyde says he can't believe it. Lincoln agrees because Lori didn't say sorry to him but Clyde misleads this as he ends up happy because Lori touched them (because of his ordeal crush on her). Lincoln snaps Clyde out it, saying that Lori only cares about talking on her phone. He also says he's going to give her a voicemail she never forgets. Clyde asks what he's going to say, and Lincoln digs through his drawer and pulls out a note labeled "Why (Blank) is the Worst Sister Ever". Lincoln says he didn't know which sister was gonna get it. After writing down Lori's name in the blank, because he made his decision about who will get it, he uses his duck phone and calls Lori. Her ringtone rings while Luna plays a chord from her guitar. Lincoln says Lori's phone is in her room, so he leaves it on her voicemail. Once the voicemail comes, Lincoln says a long and inappropriate message with Luna playing on her guitar to censor it, with Lincoln finishing it by yelling "And that is why you are worst sister ever!", and hanging up, and Clyde, horrified at what Lincoln has just said to Lori, faints. Lori then suddenly invites herself in Lincoln's room and says sorry for breaking his game, it turns out that Lori bought him a new one while she went out. Lincoln is puzzled by this. Realizing he made a terrible mistake, Lincoln immediately regrets this, as he decides to delete the message before she hears it. While the duo looks through the hallway, they see Lana and Lola following tracks as Lori locks her room using a keypad before walking downstairs.
Lincoln's plan is to infiltrate her room to delete the message, but Clyde says her room is locked. Lincoln says to be a lookout, much for Clyde's excitement. Their plan is a go, as they fist bump. Lincoln sees Lana and Lola discover poop on the floor, so he has to go over them. After diverging the twins to chase Geo, he goes through Luna and Luan's room through the vent. Clyde has a map of the vent.
Lincoln is in her room. Clyde informs him that Lori is coming, but Lincoln says to stall her. Clyde wears a tux to distract her, while Lincoln successfully deletes the voicemail and escapes. It turns out that it was actually imaginary and that was how Lincoln was gonna do it. He gives Clyde blueprints, but they're covered in ketchup. Like the imagining, Lori locks her room and walks downstairs. Lincoln sees the twins profiling Lily, so he goes into the vent. He finds Lucy, much to his terror. She explains that she writes her poems there, as she reads one.
He falls in the bathroom but is saved by Lucy. He finally finds the vent to Lori's room, he uses a rope. Lincoln asks Clyde what the rope is made out of, but since it's actually cherry licorice he falls. Lori is downstairs watching TV. She hears noises, which alerts her to go upstairs. Clyde quickly informs Lincoln she's coming, but unlike the imagining, him stalling her fails. Lincoln grabs the phone and about is to delete it, but hears Lori so he hides under Lori's bed. Lincoln is seen behind a curtain, tries grabbing the phone, but his pet bird Walt pecks him because he mistook him for the phone. Suddenly, Lori's phone rings.
Lori finds recorded messages on there. Lincoln informs Clyde, but the latter is shocked as he faints once more. After hearing a couple of voicemails from Bobby, which Lori saves, Lincoln runs, but the twins catch him. He creates a divergent by saying Luan escaped. Lana wants to run after him, but Lola stops her and goes for doughnuts.
Lincoln frantically reaches downstairs, but fortunately, Lori deletes the message. She berates him once more for calling her. Lincoln apologizes. Instead of being angry with her brother, Lori just lets it slide because he was mature, he sends a complaining message to her, when she broke his toy. Lincoln nervously agrees. Bobby calls her and she answers. Lincoln was lucky and says to the viewers if he has a problem with one of his sisters, instead of writing them a nasty letter and sending a bad message, he just talks to them. He realizes the letter is missing.
In the bathroom, while talking to Bobby, Lori finds Lincoln's letter and reads it for herself. She hangs up on Bobby and furiously claims that she's gonna turn Lincoln into a human pretzel. Lincoln searches, only to find Lori furious at him about the letter. Lincoln, shocked, decides to do the "Running Man" and quickly running downstairs. Lori exasperatedly curses at Lincoln in a blind rage, while Luna plays on her guitar to censor it just like on Lincoln from earlier, thus ending the episode.
Luna has no lines in this episode.
‣ How Cool Is Spying? - Ron Brettell, Ryan Grogan, and Jerry Barnard [Title card]
This episode is available on the "Welcome to the Loud House" DVD.