The first season, consisting of ten episodes, premiered onNetflix on September 29, 2017, and the second season was released on October 5, 2018. The third season was preceded by aValentine's Day special episode on February 8, 2019, and the rest of the third season was released on October 4, 2019. In July 2019, Netflix renewed the series through to a sixth season. The fourth season was released on December 4, 2020, and the fifth season was released on November 5, 2021. The sixth season premiered on October 28, 2022. A seventh season premiered on October 20, 2023. In April 2023, the series was renewed for an eighth and final season, making it one of Netflix's longest-running original scripted series ever produced. The final season was released on May 23, 2025.
Since its release, the series has received critical acclaim. A spin-off series titledHuman Resources debuted on March 18, 2022, and ran for two seasons, concluding on June 9, 2023. In September 2023, Netflix confirmed that the series was cancelled after two seasons.
The series follows a group of middle school teenagers, including best friends Nick Birch and Andrew Glouberman, as they navigate their way throughpuberty with struggles such asmasturbation and sexual arousal all in theWestchester Countysuburbs ofNew York. Acting as over-sexualizedshoulder angels are the hormone monsters: Maurice (who pesters Andrew and Matthew and occasionally Nick), Connie (who pesters Jessi and Nick and occasionally Missy) and Mona (who mainly pesters Missy). Throughout the series, the kids interact with people and objects who are often personified and offer helpful, yet confusing, advice in their puberty-filled lives including the ghost ofDuke Ellington, a French-accentedStatue of Liberty, apillow capable of getting pregnant, a capsule ofAdderall, and even Jessi's ownvulva, alongside other supernatural creatures that represent a human emotion like The Shame Wizard, the Depression Kitty, Tito the Anxiety Mosquito, and the Lovebugs Walter, Sonya and Rochelle. They seek out their destiny as puberty challenges them mentally and physically.
Nicholas Arsenio "Nick" Birch, anadolescent boy living with his loving and open-minded parents. He also has an older brother named Judd and an older sister named Leah. Throughout the series, Nick is increasingly insecure about his masculinity and overall development as it becomes evident that he is alate bloomer compared to his friends. Occasionally, he learns to appreciate his body and his emotions, with the help of his loved ones and a few other figures.
Maurice the Hormone Monster, also known as "Maury", full name Maurice Beverley, is a raspy-voiced monster who follows Andrew around and is responsible for his brooding sexual desires, which frequently occur at inappropriate moments. He is revealed to hail from an alternate dimension where several different creatures, such as himself, represent and manage the stages of human life. He is shown to be able to interact with other boys, such as Nick and Jay. He is also Matthew's hormone monster.
Coach Steve, the shrill-voiced middle school gym class teacher who is incompetent and overly talkative, often trying to get his colleagues—or even the students—to hang out (usually to no avail). He is extremely childlike. It is revealed in season 2 that he is a virgin, though he ultimately loses his virginity to Jay's mom, with whom he has a one-night stand after she sexually approaches him. He is the only character unaffected by The Shame Wizard because he is incapable of experiencing shame. In season 3, he has a different job every time he appears until in the episode "Disclosure the Movie: The Musical!" he gets his job back as a gym coach.
Rick the Hormone Monster, an old, dysfunctional yet enthusiastic hormone monster who follows Coach Steve and later Nick. He soon retires, however, after Steve loses his virginity, handing his position as Nick's hormone monster to Tyler. He becomes Nick's hormone monster again after Nick and Connie part ways.
Lola Ugfuglio Skumpy, an ill-tempered popular girl who is terrified of losing her social status and the approval of her best friend Devin. She has a relationship with Jay in season 4, but it ends badly. Her relationship with Jay becomes on again-off again in the following season.
Nick Starr, the future version of Nick who hosts a game show and lives alone with a robot version of Andrew.
Stu, Marty's old and weak lovebug, Marty is only convinced to stay by his lovebug. Marty blames Barbara for changing, but she points out that he used to be a sweet romantic, and he is shocked to find out she's been unhappy for years.
Kroll also appears as himself in live-action in the season five finale, as the person in charge of Human Resources.
John Mulaney as Andrew Glouberman, a young boy and Nick's best friend who spends much of his time furtivelymasturbating. He is Jewish and his dysfunctional family annoys him. But with the help of Maury, he had a secret anthology of Puberty. In season 4, he went to Summer Camp and bullied Nick, giving him the nickname "soup". He may or may not be bisexual. Despite conclusively discovering he is not gay in season 1, in subsequent seasons, he appears to be very attracted to male figures such as Michael Angelo and Mr. Keating.
Mulaney also voices Mint, Grandpa Andrew, Babe the Blue Ox, and Detective Florez.
Jessi Klein as Jessica Cobain "Jessi" Glaser, a sarcastic and smart girl. Her father, Greg, is an unemployedstoner and her mother, Shannon, is secretlydating another woman. Her parents later divorce. She gets herperiod for the first time on a school trip to theStatue of Liberty. Though Jessi has kissed Nick before, specifically in the first episode "Ejaculation", she later has manyFrench kissing make-out sessions with Jay. Like Andrew, she is Jewish, as she has aBat Mitzvah in "I Survived Jessi's Bat Mitzvah".
Klein also voices Jessi's possible ancestor, Margaret Daniels, in "Duke".
Jason Mantzoukas as Jayzerian Ricflairian "Jay" Bilzerian, a brashteenage boy who is obsessed with magic and sex. He has sex with a pillow that he made into asex toy. His mom has a one-night stand with Coach Steve in Season 2. He has two older brothers, Kurt and Val, who frequently bully him. His dad is a divorce lawyer, and Jay has a habit of quoting his father's law commercials, often being told by his friends to stop. Jay is obsessed with Nick's mother and father and wishes for a loving family. In season 2, Jay shares a kiss with Matthew, an openlygay boy in school, during a game of "Smooch or Share". After the two kiss, Jay questions hissexual orientation. During season 3, Jay continues to question his sexual orientation but comes to the conclusion he isbisexual. In Season 5, Matthew breaks up with Aiden because he has truer feelings for Jay. Jay and Matthew decide to go to Devin and Devon's New Year's party together.
Mantzoukas also voices Guy Bilzerian, Jay's father who is a corrupt divorce lawyer, and the landlord of a seedy all-men motel called "Guy Town". His commercials are well known in the neighborhood and Jay takes every opportunity he can to quote them, to the ire of his classmates.
Jenny Slate (seasons 1–4)[2] andAyo Edebiri (seasons 4–8)[3] as Melissa "Missy" Foreman-Greenwald, a nerdy and kind girl who is a frequent target of Andrew's affection. Missy sometimes has trouble relating to her peers due to her sheltered upbringing and general naiveté, but during Season 3, she starts to mature (both physically and emotionally) and eventually gains her own hormone monster, Mona. In season 4, Missy also begins exploring (and more deeply embracing) her African-American heritage.
Slate also voiced Mirror Missy, Missy's verbally abusive reflection, meant to represent the insecurities over her body, as well as Missy's repressed anger.
Slate also voices Caitlin Grafton, Greg's new girlfriend and mother of Jessi's half-sister, Delilah.
Slate also voices Vicky, Cherry's delinquent friend, Taffiny, a pharmacist, a Planned Parenthood nurse, Ms. Razz, The Implant, the Fuck Gremlin, and Matthew's sister, Britney.
Slate stepped down as Missy's voice actress near the end of season 4, believing the role of an African-American character should be voiced by an African-American actress.
Edebiri is initially heard as Mosaic Missy, an amalgamation of all of Missy's different alter-egos and personality traits.
Edebiri also voices Maya.
Fred Armisen as Elliot Birch, Nick's loving father, who is a doctor and frequently shares inappropriate stories. His real name is William McGregor, as revealed in season 6.
Armisen also voices the ghost ofAntonin Scalia, a bus driver, Stavros, and Bob the Hormone Monster.
Connie the Hormone Monstress, full name Constance LaCienega, who initially follows Jessi (and sometimes Missy) around and encourages them to embrace their wildest desires. By the end of the second season, she becomes Nick's hormone monster, despite him being a boy, which works well for them both.
Diane Birch, Nick's loving mother.
Bonrad "Bonnie" LaCienega, Connie's twin sister, and Leah's hormone monster. Bonnie is a little more uptight than her twin sister and has an extreme dislike of Maury.
Rudolph also voices a bath mat, the ghosts ofElizabeth Taylor andWhitney Houston, Principal Barren, Miss Clinkscales, Ellington's piano teacher,Gayle King, and Missy's aunt.
Jordan Peele as the Ghost ofDuke Ellington (1899–1974), the jazz musician whose spirit now lives in Nick's attic and sometimes offers him advice.
FeaturingLudacris, Jay's pitbull, who suffers from a rare medical condition that causes him to become cripplingly self-aware.
Balthazar, one of the Knights of St. Joseph representing Lola's pubic hairs.
Joe Wengert as Caleb Linden, a student, implied to be on theautism spectrum.
Wengert also voices Lump Humpman, a priest, Leore Paulblart the Ponytail Killer, and Stan the Hormone Monster.
Wengert also voices Joe, an older Hormone Monster fromHuman Resources who, with Gil, becomes Elijah's Hormone Monster.
Fran Gilesspie as Samira, a student who speaks quietly and begins dating Ali.
Jon Daly as Judd Birch, the dark yet caring older brother of Nick and Leah Birch, and the son of Diane and Elliot Birch. In "Nick Starr", the Judd of 2052 now rules over "Juddstown", offering sanctuary the day before the end of the world.
Daly also voicesJesus Christ & Pumbaa, Timon's boyfriend.
Kat Dennings (seasons 1–4) withChloe Fineman (seasons 5–8) as Leah Birch, the older sister of Nick Birch and younger sister of Judd Birch.
Fineman also voices Delilah, Jessi's newbornhalf-sister, Greg and Caitlin's daughter, Timon, & Jourdan.
Chelsea Peretti as Monica Foreman-Greenwald, Missy's mother and Cyrus' wife.
Peretti also voices Cellsea, Nick's sentient cell phone that he received from Leah, and "The Pill"
Heather Lawless as Jenna "Jay's Mom" Bilzerian, Jay's mother.
Mark Duplass as Val Bilzerian, an older, bullying brother to Jay Bilzerian.
Duplass also voices a clerk.
Paul Scheer as Kurt Bilzerian, another older, bullying brother to Jay Bilzerian.
Daly also voices a motel pillow and the ghost ofHarry Houdini.
Harvey Fierstein as Jerome, an older gay man who lives in Guy Town.
Jean Smart (seasons 2–4) andMaria Bamford (season 8) as Kitty Bouchet the Depression Kitty, an anthropomorphic purple cat employed in the Department of Puberty's Depression Ward.
Bobby Cannavale as Gavin Reeves, an intense Hormone Monster that Nick hopes to have Tyler replaced, who works as his assistant and gets abused by.
Retta as Daisy Ellington, Duke Ellington's mother.
Paul Giamatti[4] as Andrew's feces, an internal representation ofconstipation within Andrew that made him develop "Poop Madness".
Maya Erskine andAnna Konkle as Misha and Izzy, two seventh-graders Nick and Andrew hook up with, and the stars of their own Netflix series,Cafeteria Girls. Their characters are a reference to their showPEN15.
Aidy Bryant as Emmy Fairfax, a female Lovebug, a friend of Walter's, and Devin's Hateworm.
TV writerAndrew Goldberg and screenwriter-directorsJennifer Flackett andMark Levin approachedNick Kroll, Goldberg's best friend since childhood, with the idea to develop a show about going through puberty.[14] Kroll and Goldberg used their divergent pubertal experiences as a centerpiece of the show, because Kroll was a late bloomer while Goldberg went through the physical changes of puberty very early.[15]Big Mouth was also partially inspired to help aid teenagers in states with abstinence-based sex education.[15] Many of their experiences are featured in the show, such as Kroll's first kiss, and Goldberg's parents waxing his mustache.[14] The show also includes an experience of their childhood friend, Lizzie, who the character of Jessi is based on, getting her first period on a school trip to the Statue of Liberty. According to Kroll in an interview onNPR,Big Mouth "takes an equal look at what it's like for girls and women, the process of going through puberty, which I think has not been quite as explored in most popular culture."[14] Netflix announced they had picked upBig Mouth in June 2016.[16]
On June 24, 2020,Jenny Slate stepped down from voicing Missy Foreman-Greenwald so that a Black actress could have the role in the wake of theGeorge Floyd protests.[17] Slate's final time voicing Missy is in the fourth season as she recorded her lines in advance.[18]Ayo Edebiri was cast to replace Slate as Missy. Her first appearance as Missy is in "Horrority House", the penultimate episode of the fourth season.[3] On April 24, 2023, Netflix renewed the series for an eighth and final season.[19] In April 2024, Netflix confirmed that the eighth and final season was set to air in 2025.[20] The final season was released May 23, 2025.[21]
The first season, consisting of ten episodes, premiered onNetflix on September 29, 2017.[22][23] On October 24, 2017, it was confirmed that a second season had been ordered,[24] which was released on October 5, 2018.[25] On November 17, 2018, Netflix announced thatBig Mouth had been renewed for a third season.[26] The third season was preceded by aValentine's Day special episode on February 8, 2019.[27] On July 26, 2019, Netflix renewed the series through to a sixth season.[28] On August 21, 2019, it was reported that the third season was set to be released on October 4, 2019.[29] The fourth season was released on December 4, 2020.[30] The fifth season was released on November 5, 2021.[31] In April 2022, Netflix renewed the show for a seventh season, ahead of the sixth-season premiere.[32] The sixth season was released on October 28, 2022.[33] The seventh season was released on October 20, 2023.[34] The eighth and final season was released on May 23, 2025.[21][35]
Big Mouth has received critical acclaim. OnRotten Tomatoes, the first season has an approval rating of 100% based on 23 reviews, with an average rating of 8.10 out of 10. The website's critics consensus reads, "Big Mouth's simplistic animation and scatological humor belie its finely sketched characters and smart, empathetic approach to the messiness of adolescence."[36] OnMetacritic, it holds a rating of 80 out of 100, based on six critics.[37]
On Rotten Tomatoes, the second season has an approval rating of 100% based on 33 reviews, with an average rating of 8.80 out of 10. The website's critics consensus reads "Poignantly repulsive,Big Mouth continues to confront the awkwardness of adolescence with foul-mouthed glee and an added layer of maturity."[38] On Metacritic, it has a score of 90 out of 100 for the second season, based on nine critics.[39]
On Rotten Tomatoes, the third season has an approval rating of 97% based on 33 reviews with an average rating of 8.00 out 10. The website's critics consensus reads, "Like the characters at its center,Big Mouth's third season continues to grow, taking on complicated new issues with the same gross-but-utterly-empathetic eye that made it so lovable in the first place."[40] On Metacritic, it has a score of 84 out of 100 for the third season, based on five critics.[41]
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 empatheticcringe comedy that manages to get even better by finally giving Missy the storyline she deserves."[42] On Metacritic, it has a score of 88 out of 100 for the fourth season, based on four critics.[43]
On Rotten Tomatoes, the fifth season has an approval rating of 100% based on five reviews.[44]
On Rotten Tomatoes, the sixth season has an approval rating of 100% based on four reviews.[42] On Metacritic, it has a score of 84 out of 100 for the sixth season, based on three critics.[47]
On Rotten Tomatoes, the seventh season has an approval rating of 71% based on seven reviews.[48] On Metacritic, the seventh season has a score of 68 out of 100, based on four critics.[49]
Vox described the first season as sharp and jarring depicting the awkwardness of pubescence, post-pubescence, and pre-pubescence.[52] Erik Adams fromThe A.V. Club awarded the second season an "A−". Adams praised the cast, especially Thewlis, and the experimentation of this season, commenting that "it's shown that it deserves to be included in any conversation about TV's animated greats."[53]
On October 3, 2019, Netflix announced a straight-to-series order for aspin-off series titledHuman Resources, set within the show's universe. Kroll, Goldberg, Levin, Flackett and Kelly Galuska will produce.[81] On June 14, 2021, more details of the series were announced, including casting. Kroll, Rudolph, Thewlis, Bryant, Cannavale, Newton, Bamford, Goodman, Palmer, Clement and Adlon reprised their roles for the spin-off, with additional cast membersRandall Park,Rosie Perez, andHenry Winkler joining the series.[82][83][84] It was released on March 18, 2022.[85]Human Resources then released its second and final season on June 9, 2023.[86][87]
