NOTE: This spoiler was sent in by Courtney.
It’s 1986 in Cleveland. The band Vesuvius is playing in a bar and the crowd is going wild. The band consists of 4 members Lex (Will Arnett), Kerr (Fred Armisen), Trash (Bradley Copper), and Robert ‘Fish’ Fishman (Rainn Wilson). They all have the big 80s hair and tacky clothes. They look like a mix of Kiss, Aerosmith, and Guns and Roses. The crowd is going wild and at the end of their last number they go even wilder. Fish jumps out from behind the drums and throws his extremely sweaty vest into the crowd knocking a woman over. The crowd still goes wild and Vesuvius goes backstage and celebrates. They keep talking about how great the show is and high fiving each other. They all cheer on how famous they’re going to be and their manager comes down to congratulate them on a good show. He gives Fish the money to go buy some beers and Fish leaves to go back to the bar. Backstage the agent tells them how Matchbox Records really wants to sign them and how big they’ll be there’s only one catch. They have to drop Fish so the record label’s owner’s nephew can be the drummer. The band protests saying no because he made the band, came up with the name, and wrote half of the songs. The manager says he understands and gets on his very large, 80s cell phone to call the record label to cancel their deal. He mentions while on the phone that they’ll be opening for White Snake and the band members change their minds and decide to leave Fish behind. The manager goes back to the bar and breaks to news to Fish. Fish drops all his beers and runs out back to see the band driving off in their van. He chases them and almost makes it through the back door but they drive off leaving him behind. In the van they all talk about how it’s ok that they leave Fish because he wasn’t all that great and how they’ll never get the opportunity again. While drinking Jack Daniel’s, Trash spits it out in shock because Fish amazingly caught up with them and is running right by the van. But they get ahead of him and think they’ve lost him. Again he finds his way to the roof and stabs his drumsticks in the roof of the van attacking them all. They put on brakes and he falls to the ground. He sits up and looks at them all. Instead of doing the right thing they back the van up and drive off.
20 years later Fish is working at a call center looking miserable. One of his co-workers keeps talking about the new Vesuvius album that’s out and how awesome they are. He keeps bugging Fish about it and he says he knows but isn’t that big a fan of heavy metal. His co-worker says he needs to hear it and puts it in his computer to start playing the music. Fish gets upset but ignores it and takes his next call. The co-worker plays it louder and louder bugging Fish to rock along. Fish puts his call on hold and starts pummeling his co-worker. Later on he’s fired and thrown out and catches the bus. Adding insult to injury there are Vesuvius posters all over the place and on the bus he catches even an old man is reading a Rolling Stones magazine with the band on the front. Fish arrives to his place and his girlfriend, Carol (Jane Krakowski) tells him she can’t make it works since he lost his job over something that happened 20 years ago. She’s about to break up with him and Fish interrupts so he can break up with her first. He then tells her to get out and she says how since it’s her apartment. Fish leaves with all his stuff.
He arrives at his sister Lisa’s (Jane Lynch) and is eating dinner with the family. She tells him that she’s sorry he lost his job but asks if he’ll get on his feet within a week. He says no he can’t do that and needs to stay a little longer. He then asks his brother-in-law, Stan (Jeff Garlin) how his nephew Matt (Josh Gad) is doing. You can tell Stan admires that Fish used to be a rocker while Lisa is annoyed he won’t give up the dream. Stan tells him that Matt got into MIT and that he’ll be playing with his band at the prom. Fish congratulates him but his niece Violet (Samantha Weinstein) rudely says that it’s not that great. Matt tells her to shut up. Fish says it’s a good way to get to the prom and Violet says it’s the only way he’ll get to go. Matt says if she doesn’t shove it he’ll shave her head in her sleep. Violet says she’d still be the pretty one and Lisa makes them stop. Fish follows Matt upstairs and asks him what his band is and he tells him it’s called ADD. Fish thinks it’s called add and Matt has to tell him it stands for Attention Deficit Disorder. Fish says it sounds better and wishes him luck with the show. Lisa then takes Fish to his room and tells him he needs to get a job and leave. Fish asks why she always talks to him like that and she says it’s tough love. He says why can’t she give him kind love instead and she says because he needs a reality check. That night he goes to sleep looking at the stadium in Cleveland.
The next day ADD consisting of Matt, Curtis (Teddy Geiger), and Amelia (Emma Stone) are waiting for their drummer. Their drummer shows up with his mother yelling at him and she tells him to explain what happened. He explains that he brought hash brownies to class and got everyone high and his mother yells at him to tell what else he did to the teacher. She angrily blurts out that he drew a penis on her forehead and now he’s suspended and can’t go to prom. He also won’t get to walk at graduation he leaves with his mother smacking him. They panic and Matt mentions his uncle Robert (Fish) used to play for Vesuvius. Curtis says no and Amelia says they can find somebody else. They then have a series of auditions that go wrong. They have a tatted up drummer with no rhythm, a beat boxer, and a techno dancer. It wakes Fish up and goes to the garage unplugging the device calling it a disgrace to real drumming. The kid says that tons of songs have techno and Fish fires back that just because they play Celine Dion in elevators doesn’t make it right. The kid leaves and Fish says his work is done and leaves. Curtis and Amelia look at Matt and ask if that’s his uncle. Matt says yes and thinks it would be a good idea to have him play at their prom. Matt goes upstairs and asks Fish if he’ll do it. Fish says he hasn’t played in 20 years and doesn’t plan on playing ever again. Matt says that since Fish hasn’t been a good uncle it would be nice. He mentions that he only comes around for money or when he’s down on his luck and that he called Matt Max for many years. He tells Fish that it would help him to get girls to like him and Fish starts to listen thinking about his glory days. Matt says it would mean a lot to him since Fish is family it would make up for all the times he let his family down. Matt leaves and Fish starts to think about it.
On prom night Fish is walking down the hall in his tacky, dated rock clothes. ADD is sitting in the back room waiting for him yelling at Matt that Fish was supposed to be there. Matt says not to worry that Fish will be there and he shows up acting arrogant even though he’s late. Curtis says they’ll be opening in 5 minutes and Fish looks shocked saying because they’re the headliner they shouldn’t start until 11. Amelia says because it’s the prom it ends at 11. Fish gets nervous and pukes. He then takes a piece of his puke and puts it in his pocket. Amelia asks if he just and he says yes he uses it as a good luck charm. They all get grossed out and go out on stage. Curtis tells Fish to follow his lead and he does. The band starts playing and at first are a hit with the school. Then the prom king and queen are called to do a dance. ADD starts singing a slow song, but Fish starts to get carried away. He starts playing out of rhythm and goes wild. The crowd stops and horridly stares at Fish. He then throws his drumsticks out in the crowd and everyone keeps staring at Fish. ADD storms off mad at Fish because he ruined the show. He keeps going on about how great it was and madly Curtis kicks Fish out of the band.
The next day Fish is upstairs and feels bad about what he did. So he won’t feel like such a jerk he goes to Curtis’ house to apologize. He comes to the door and Curtis’ Mom, Kim (Christina Applegate), is tending to her plants. Fish approaches her and asks for Curtis. Kim asks who he is and he tells her. She says she didn’t know he was so much older than them she thought he was college age. She tells him her name and he notices that she only said Ms. not Mrs. He tries to ask her out and Kim turns him down. She lets him in and he starts talking to ADD about how he screwed things up. He apologizes telling them he has an idea and that they can make it as a band since they have a moody rocker, a punk chick, a tech nerd, and a sloppy drummer. He also tells him that he’ll get the band gigs. Matt tells Fish to go outside and they’ll think about it. While Curtis is quite doubtful, Matt and Amelia agree with Fish that they do have the typical rock band and that if he could get them gigs they would have a possible career. Curtis agrees to it and says he’ll make Fish apart of the band if he can get them gigs. They look outside while Fish stands on a swing swinging it back and forth.
Soon Fish is trying to get ADD gigs. He’s calling every bar in town and everywhere to get a venue for the band. He goes to a coffee shop and runs into Curtis writing songs in his notebook. Curtis looks pissed to see Fish but Fish sits down at his table anyways. Fish asks him if he’s writing and Curtis says yes. Fish asks if he can read some of his lines and Curtis closes the book. Fish then starts saying in a band people should share everything. Reluctantly Curtis gives him the notebook and Fish tells him how talented he is. Fish then starts to ask Curtis if his dad just ran off and Curtis says yes. Fish says he’s sorry and that he’ll be ok and he’s glad that they’re in a band together. Curtis then asks Fish if he found them a gig spot and Fish lies saying that it’s going well. Curtis tells Fish that none of his demos have done well and it’s a stupid dream for him to hold on to. Fish decides to use an old method of getting in the car and blasting his demo while driving down the street. He says if it makes him feel like he’s on top of the world then he is worth a record deal. They get in the car singing ADD’s music and Curtis starts feeling good about his music. It works so well he starts warming up to Fish and feels more confident. The next day Lisa answers the phone and yells for Fish. Fish answers the phone and yells in excitement obviously getting them a gig. Fish runs to the garage and tells ADD they got a gig in Fort Wayne, Indiana. They all protest that they’ll never be able to go because of their parents. Fish tries to convince them to go without permission but they say no. Suddenly Amelia comes up with the clever idea to lie about going to a church retreat since most parents buy into it. They all say yes and prepare for the trip. Saturday night Fish steals Lisa’s car and is driving Matt, Curtis, and Amelia. Curtis is writing again and Fish asks what he’s writing this time. He reads some lines about being bitter and Fish instantly loves it. Fish gets them all hyped up about going to their first gig talking about how nothing can stop them. Unfortunately they get pulled over by the cops and have to stop.
The next day Lisa’s yelling at Fish about stealing her car. She grounds Matt and kicks Fish out the house. Stan thinks it’s cool and risky that they stole her car to do a gig but Lisa yells at him to shut up. When Fish leaves, Stan tells him to take care of himself and Fish tells Stan to rock on. That day Fish goes to a Chinese food restaurant with the owner to the basement. The owner tells Fish he ordered so much it paid for his kids to go to college and that he can stay until he gets back on his feet. The owner hands Fish a large spoon and Fish asks what it’s for. He tells him to kill the rats that frequent the basement. Soon a rat comes out of a corner and Fish almost hits it when Matt comes downstairs to find him. Fish asks Matt what he’s doing there. Matt tells Fish even though he’s grounded and can’t see Fish again he came up with a solution so they can still practice and brings Fish a laptop so they can practice together online. The next day they connect on their computers to practice. Fish keeps checking the microphone and camera to see if it works. He hears the others of ADD and walks back to his drums. But he’s completely naked butt showing in the camera nothing left to the imagination. They all freak out until he sits down to start drumming. It doesn’t make it any better because he keeps moving around with everything freely hanging in the camera. At the same time Violet is trying to do a school project over the internet and on the phone complaining to her friend that she can’t make the internet go fast enough because of Matt practicing with the band. She pulls up the page of them practicing and sees Fish naked. She freaks out at first but then puts them on YouTube to humiliate Fish. It instead works in their favor and the band gets over 1 million hits. People even recognize Fish with clothes on in public.
Fish comes home and Lisa, Stan, Matt, and a manager, David Marshall (Jason Sudeikis), are all standing on the front porch. David tells Fish that he’s a hit and that even though they mainly look at the video to see the naked drummer they start singing the songs and that Matchbox Records wants to sign them. They later go to a recording studio starting to play their music. At first the song Curtis wrote about being bitter is too depressing and needs to be changed. Fish tells Curtis to sing he’s not bitter and to make it a lot more upbeat. They give it a shot and it works making the song easier to rock to. David loves it and offers them a summer tour. In Matt’s garage, his, Curtis, and Amelia’s parents are listening to Fish talk about achieving their dream and how going on tour would be a good idea. Kim interrupts and says she doesn’t think it would be right to let the kids keep thinking what if all their lives. They agree with her and let the kids go on tour with Fish. The next day the tour bus pulls up and they tour around the Midwest. They first go to a bar and start encountering technical difficulties. But they bounce back and start getting the attention of the crowd. After the show, a fan comes backstage to tell ADD how great they are. Fish tells them they just got their first fan. He then hugs all 3 of them very, very sweaty making them all wet. Soon some groupies come downstairs offering to buy beer. Fish says no because they’re underage but he’ll gladly take a drink. The groupies say no they wanted to talk to the boys more their own age and leave. Matt, Amelia, and Curtis go upstairs and play video games and text while Fish comes in asking why they aren’t partying like real rock stars. They say they’re tired after playing and just want to rest. Fish tells them they aren’t real rock stars and starts jumping on the bed and breaking things. While on tour, they play a show and go to rest, Fish is getting into any and everything out there. He’s jumping off roofs, jumping in pools, and getting drunk at bars. It all goes wrong when the band is having a party in the hotel room and Fish throws a TV out the window. They all get arrested and are sitting down after getting mug shots. Fish goes to Curtis telling him that’s what being a rock star is all about. Curtis says he’s all about the music. Fish tells him he’s right and Curtis tells him why music has been important to him. He says he hopes his father will come back one day if he sees him in music and how talented he is. Fish says he can’t keep looking for something that’s never going to happen and that Curtis’ dad lost out. Curtis smiles at him and the cop comes to them letting them know they’ve been bailed out. Fish thinks its some fans but then finds all of their parents there. They all yell at Fish knowing he wasn’t a mature adult. But Curtis yells they can’t quit the tour and disappoint all the fans they have. Kim volunteers to go on tour with them.
On the tour bus Kim and Fish are already at odds with each other. Fish tells her how she’s killing his buzz and she says had it not been for him she wouldn’t be on the bus. He takes a nap and they ride along. The tour is going well while on the bus the band starts to discover some things about each other. Since the beginning Fish has been trying to get Amelia to smile but she won’t. Curtis tries to make her smile and even glances at her to see if anything makes her smile showing that he likes her as more than a friend. After another great performance David tells them they have a music video shoot. They get excited and soon show up at the shoot. Everyone is standing there ready until they notice Amelia’s not coming out. Kim runs out with a woman dressed as Amelia and she tells them it’s a bad day for her. Fish goes to her dressing room to handle it. Amelia yells that she’s upset the stylist brushed her hair and she let’s Fish see her. It’s all messy and big and all over the place. She says if that’s what people want her to look like then she doesn’t belong in music because she isn’t like all the other pop stars out there. Fish tells her she’s not like them and that he’ll help her with her hair. She comes out looking like herself again and thanks Fish. You can tell Curtis is looking for a smile but it still doesn’t come. At the shoot Kim and Fish start talking. Kim tells him she used to be a rocker in an all girl band when she was young. He asked why didn’t she stay with it and she tells him a 17 year old pregnant lead singer didn’t set well with MTV. Fish tells her they had limited vision and starts to see some similarities in both of them. That night after another performance the band does well and David invites them to a YouTube party. A yellow Hummer limo pulls up for them to get in. Amelia, Curtis, and Matt all run into the Hummer while David tries to make a play for Kim. He first asks her if she’s heard of a MILF and then says he’d never call her that. He calls her a MILMSLT (mom I’d like to make sweet love to). She then calls him a PILS (person I’d like to slap). David leaves embarrassed while Fish walks out there. Kim asks him why Fish isn’t going to a party and he tells her she found 2 ladies to go on a date with. He says goodnight while she goes back to her hotel room.
At the YouTube party, they’re all socializing with the other patrons. Matt is walking around nervous, Amelia notices and walks over to him asking him what’s wrong. He says he can’t talk to girls and wants to talk to a girl with a shirt on saying she loves him. Amelia says it shouldn’t be so hard but he still punks out saying he’s never kissed a girl. Amelia kisses him and makes him go talk to the girl and he finally approaches her. Amelia looks over at Curtis seeing him bombarded by a bunch of girls and she looks away. Curtis then looks to see her soon bombarded by a bunch of guys asking for her autograph and he looks away defeated. In the hotel parking lot Fish sees Kim playing Guitar Hero in her room and knocks on her door to get in. She lets him in and they play together.
In David’s office ADD and Kim sit together to see the new video they made. Problem is Fish’s face is being covered the whole time by the editing. But the good news is they’ll be released to TRL at number 9 in a month even though the video hasn’t been released yet. David then tells them they have a chance to play at the biggest venue in Cleveland with 20,000 fans and open for Vesuvius. They all pause and have a look of horror on their faces. Fish storms out and goes to the roof saying no he won’t do it and Kim chases him up the stairs. Downstairs Curtis says no they can’t do it because they’re a band and they’re a family and would never do that to Fish. At first David tries to get them to drop Fish because he’s old and so accident prone he’s basically in a full body cast. The band still says no keeping Fish unlike his last band. David says ok and walks away to the roof to talk on the phone and possibly convince Fish to do otherwise. On the roof Kim tells Fish he needs to grow up and that he should take the opportunity for ADD since it’s been 20 years he should get over it. Fish won’t shut up and Kim kisses him right when David walks to the roof to catch them. Kim tells him she did it to shut him up. David then goes to the elevator and catches Curtis on the way up. He tells him he’s glad they’re keeping Fish since he’s banging Curtis’ mom it would make since. Curtis gets mad and goes to his room. The next night they perform at another venue and again have a happy crowd. Curtis then tells the crowd he’s happy they’re going to open for Vesuvius even though the rest of the band didn’t know it. Fish says he won’t do it and Curtis says they will since he shouldn’t be such a loser if he’s dating his mom. Fish gets so upset he jumps in front of the stage spraining his ankles with already broken bones. Kim looks shocked to hear the news and when Fish runs out back she chases him. He says he won’t do it and Kim says he needs to grow up again. He says she didn’t want to give up on her dream either but she says it’s true she just chose to grow up. Soon Fish quits the band and goes back home to the basement of the Chinese restaurant.
The band gets a replacement drummer who seems to be completely ungrateful and nonchalant about getting the spot. He doesn’t even fit their image. Fish decides to get a job while Stan helps him in the interview because it’s where he works. Fish also cuts his hair off to look the part totally giving up on the dream. That night Amelia and Matt are waiting for Curtis while the replacement drummer isn’t paying any attention to them blasting his headphones. Curtis comes in and Amelia yells they’ve been waiting for 2 hours while he was hanging out with groupies obviously mad. Matt tells him they need Fish back and that Curtis was mean to him. Curtis said he was selfish and immature and they replacement drummer is fine. Matt says he’s not because he looks like an Abercrombie model. Curtis walks off upset.
The next day Fish is going to work and sitting at the table eating lunch. Curtis approaches him at work and sits down to tell him he’s sorry and how much it would mean to him if they played for Vesuvius. Fish still refuses and Curtis tells him he’s not a working stiff. He tells him he needs to stop going after something that was never there and to open that night with them. Fish changes his mind and gets excited enough to jump on the table to be crowd surfed out by Stan and his co-workers. That night they show up at the arena and David tells Fish he’s glad he’s back after the big fight. They all go backstage to change for the show and rehearse when the members of Vesuvius run into ADD. They start talking to ADD and Fish asks if they remember him. They laugh and say they do remember him the whole time in a British accent. Fish asks why they changed their accents all of the sudden even though none of them are from England. Fish then says he’s been waiting for 20 years to tell them what he’s wanted to do and says if it were a week ago he would be clawing their faces. But now he’s over that and wishes them good luck. They part ways and ADD goes to perform. After a good show and the crowd going wild ADD goes off stage. Curtis then asks Amelia if she would like to go to dinner and she says she’ll call Matt. He says he just wanted it to be the 2 of them and she gets excited enough to smile and say yes. Fish is happy that she smiles and she keeps smiling for a while. Next Vesuvius is being cheered on stage and ADD watches them from the side. During the show things are going wild until Lex drops his microphone while singing and the music skips for a little bit showing they’re lip synching. The crowd doesn’t notice it until Lex runs around on stage trying to cover it up and knocks over all the equipment by accident because of his mistake. It costs him because the sound crew can’t fix it and the crowd knows booing them off stage. ADD looks shocked that for 20 years Vesuvius isn’t singing anymore while David is on the phone freaking out to the record label explaining it as an Ashlee Simpson situation. Vesuvius is kicked off the stage by beer cans and everything else being thrown at them and they angrily leave. Soon the crowd keeps chanting ADD over and over again. David says no it doesn’t look good outdoing Vesuvius and it would piss of the record label. Curtis says they don’t have a choice they have to go on stage and perform and get a new manager. David changes his tune saying he’s ok with it but Fish tells him once again he’s fired. They go on stage and perform to a crowd of screaming fans and the movie ends with them jumping in a still shot.