Nick arrives at camp and meets up with his friend Seth Goldberg. Their cabin meets Natalie, a former member of their cabin who has transitioned. The boys all make her uncomfortable and she ends up switching to a girl's bunk. There, the girls all treat her weirdly and Jessi hates her until she realizes she is all alone and the two become friends. Andrew arrives at camp after his parents drop him off and Nick attempts to make him jealous until Seth and Andrew become friends. Nick starts feeling left out as the two of them are hanging out more. Eventually, he breaks down and runs into the forest where he has a panic attack and is bitten by a mosquito named Tito.
33
2
"The Hugest Period Ever"
Bryan Francis
Kelly Galuska
December 4, 2020 (2020-12-04)
After a disastrous morning of showering with the boys, Nick decides to hold off on showering. Meanwhile, Jessi gets another period at camp and learns how to insert tampons. Meanwhile, Missy and her parents travel to Atlanta to visit her cousins, who help Missy embrace her Black identity.
On the last day of camp, Nick bombs at the talent show, Andrew deals with constipation, and Seth and Natalie hook up. Back in Westchester, Jay and Lola invite their friends to a pool-warming party.
35
4
"Cafeteria Girls"
Andres Salaff
Emily Altman
December 4, 2020 (2020-12-04)
On the first day of the eighth grade, Nick and Andrew try to hook up with two seventh-grade girls. In New York City, Jessi is having trouble adjusting to her new school.
36
5
"A Very Special 9/11 Episode"
Bryan Francis
Jak Knight
December 4, 2020 (2020-12-04)
The kids at Bridgeton Middle go on a field trip to the National September 11 Memorial & Museum. Nick and Andrew ditch the trip to meet up with Jessi and her new boyfriend, Michael Angelo. Matthew decides to mess with Coach Steve, whose birthday happens to also be on September 11, but feels bad after Coach Steve learns about the attacks. Missy and DeVon also ditch the trip to meet with her cousin Lena, as DeVon teaches Missy about code-switching.
37
6
"Nick Starr"
Dave Stone
Victor Quinaz
December 4, 2020 (2020-12-04)
In the year 2052, Nick is now a successful game show host in a dystopian Earth, with only a robotic assistant modeled on Andrew as company. Shaken by the news of Missy's death, Nick is given two passes for a space ark as the planet will be ending the next day. After going through old contacts, he picks Jessi to join him, now an activist protesting for the downtrodden. While on his way to the funeral, Nick crashes on a street and is taken by Jay to his childhood home, where he and Lola run a sex cult and have Nick's parents as sex slaves. At the funeral for Missy, Nick approaches Jessi, who agrees to go with him. The two flee when a recorded message from Missy plays, revealing that she was murdered and the existence of the space ark. After making their way through angry mobs and wasteland riders, the two proceed to the ark and have sex as the planet is destroyed. However, Nick is unable to perform, and Jessi reveals that she only played him to get access to the ship and destroy it. As Jessi blows up the ship, Nick escapes in a spacesuit with Tito, the anxiety mosquito. However, the entire episode is then revealed as an anxiety dream Nick has on the bus from the previous episode.
After being upset from their exclusion from the previous episode, Maury and Connie watch four different stories about giving hand jobs.
"Touched by a Jay-ngel": Rumors fly that DeVon divorced Devin because he would not give her a hand job. After a poor attempt, Jay asks Lola to guide him through his hand job.
"The Hand M-Aiden's Tale": Matthew hangs with Aiden's friends, and Maury suggests Matthew give Aiden a hand job.
"The Glouberman Method": Nick is unimpressed with Andrew's Bob Fosse-esque method of masturbation, so Andrew decides to masturbate without the method, only to get some sad news.
"Blue Balls": Michael Angelo tells Jessi to give him a hand job to satisfy his blue balls, but when Jessi sees Michael Angelo's penis, she laughs, and they break up.
39
8
"The Funeral"
Bryan Francis
Joe Wengert
December 4, 2020 (2020-12-04)
Andrew and his friends attend a funeral for Andrew's zayde, whom Andrew still believes died because he did not masturbate right. Nick wants to tell Jessi about his dream. Meanwhile, Matthew's mother accidentally sees his phone and discovers he is gay and excludes him from the church cook-off. As revenge, Matthew and Aiden decide to compete in the cook-off.
40
9
"Horrority House"
Dave Stone
Emily Altman & Victor Quinaz
December 4, 2020 (2020-12-04)
On Halloween night, the gang goes to a haunted sorority house, where they become the victims of a trippy hazing, despite being underaged and not students at their university. Jay tells Lola that he loves her, but Lola does not reciprocate, which upsets Jay.
41
10
"What Are You Gonna Do?"
Andres Salaff
Gil Ozeri
December 4, 2020 (2020-12-04)
Following the events of the previous episode, Nick's body has been taken over by his darker future self "Nick Starr", who proceeds to push away his friends with his behavior, leaving the present Nick as a "lost soul" in ghostly limbo with Duke. Meanwhile, Matthew comes out to his father, who admits that he had always known and accepts him and comforts him by saying his mother will understand in time. After an attempt to force Starr out of his body fails, Nick manages to recruit Andrew and Missy in a mission to jump into his body and force out Starr. The battle in Nick's mind becomes devastating, with a giant Anxiety Mosquito on Starr's side, with a kaiju-style battle with the Gratitoad (brought by Jessi) but eventually, Starr is defeated, and a scared version of Nick within combines with the real Nick to become one. After this, Rick the Hormone Monster ends the episode with a musical number.
Reception
Critical response
On Rotten Tomatoes, the fourth season has an approval rating of 100% based on 22 reviews, with an average rating of 8.30 out of 10. The website's critics consensus reads, "Big Mouth's fourth season is another tour de force of empathetic cringe comedy that manages to get even better by finally giving Missy the storyline she deserves."[2] On Metacritic, it has a score of 84 out of 100 for the third season, based on five critics, indicating "universal acclaim".[3]