"Left in the Dark" is the Season 1 premiere, as well as the series premiere, of The Loud House.
The show starts with a commercial for the reality series "ARGGH!". After the commercial plays, Lincoln crosses off a date on his calendar, and he is excited to watch the season finale of "ARGGH!". However, he talks to the viewers about how his ten sisters always fight over the TV remote, with a flashback to prove it.
He has a plan and uses a walkie-talkie to call his best friend, Clyde. The two decide that it is best to watch the show separately, because Clyde will obsess over Lori if he comes over to Lincoln's house. Clyde tells Lincoln that its almost 8 o'clock. As Lincoln's plan is put into action, the twins Lana and Lola come out of their room chanting "Cartoons!" Lincoln brings a tea party set for Lola and two frogs for Lana.
Lincoln sees Luan about to walk down the stairs. He tells her to get her camera because the twins are fighting, and Luan happily does so, as Lincoln holds Lily up, and gives Lisa milk, salt, sugar, flour, and eggs to keep her from watching television. He gives Lynn her football and fills it with helium, much to her amusement. He sees Leni, and lies to her about a zit on her nose. A happy Luna appears playing her guitar, and Lincoln sends her to her room with a glowing flashlight that creates a light show.
Lori looks for her phone, but Lincoln reveals that he had it, and gives it to her. Before she can berate him for stealing it, Bobby calls, and she goes into her room to talk to him. Lily falls asleep in Lincoln's arms, and lays her on the laundry. He runs downstairs and sits on the couch, only to see Lucy next to him. Lucy says that she wants to watch the season premiere of her favorite show, "Vampires of Melancholia". Lincoln cons Lucy by persuading her to use a black-and-white TV. However, the power goes out as he sets the television up. Everyone panics, and Lori asks what happened. The girls blame Lincoln for the power outage even though he didn't mean it.
Luan stops the argument by making a pun. Lisa gives her a cookie as a compliment, and Luan starts to glow. Lori scolds Lisa for turning Luan into a test subject while Leni agrees because she had a different predicament. Lisa explains that she fused the ingredients she received earlier with DNA from a jellyfish to create "Gloweos". The group huddles behind Luan.
Lori says that she is in charge, and demands a head count. Lincoln incorrectly counts all eleven of the kids. Lucy appears behind them, scaring Lincoln and informing him that he forgot to count her. Lincoln asks if he can turn the circuit breaker on. Lori then says she'll do it because she is in charge. She then asks where it is. Lincoln tells her that it is in the basement. After seeing how dark the basement it is, Lori asks why she must go down there. Her siblings angrily tell her that she is in charge. Lori tells Luan to lead the way. Unfortunately, Luan's glow wears off. Lori tells Lisa to give Luan one of her cookies, but the intelligent child says she only made one as a prototype. After hearing some moaning, Lori gets scared and an argument turns up. The twins begin to cry, thinking there is a ghost in the basement, and Lincoln calms them down. He states that he will protect them all and calls Clyde for assistance. Clyde breaks down the door and runs to the basement. However, he malfunctions after seeing Lori and runs out of the house, making robot sounds.
Lincoln uses the infrared on Luan's camera to see what is in the basement. He is forced to bring his ten sisters downstairs with him. Once in the basement, the sisters talk about their fear of the dark. Lori hears moaning and Lincoln explains that it is just the pipes settling. Leni hears scratching, but it is just Cliff scratching on his scratching post. Lynn smells something, but it is revealed to be Lily with a full diaper.
The Loud children hear a figure chanting Lincoln's name. They all panic as Lincoln attacks what appears to be a ghost. The lights are turned back on by Lori, it turns out that the "figure" was their laundry. The voice was just Clyde calling Lincoln on the walkie-talkie. Lori says that the first one to reach the TV is "couch commando". Lincoln successfully beats his sisters to the couch, but the episode ends immediately as he sits down, much to Lincoln's distress.
His sisters watch from the staircase, and feel sorry for their brother. Lori hands him a bag of popcorn, and shows him sympathy, while Luan points out that he lived it (meaning Lincoln recorded the event), and the kids watch the video Lincoln recorded. Lincoln says that while he may have missed his show, it does not matter, as he is with all of his sisters. The story ends with Lucy pointing out that they forgot about her, much to the terror of her siblings.