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The Final Bow: Every Major Star And Surprise Guest In The Big Mouth Season 8 Cast

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The groundbreaking, brutally honest animated series Big Mouth is finally closing the chapter on its characters' tumultuous journey through puberty with its eighth and final season, which premiered on May 23, 2025. This concluding run brings back the core ensemble of comedic heavyweights who have defined the voices of Nick, Andrew, Jessi, and the beloved Hormone Monsters, while also introducing a new wave of celebrity talent to usher the show toward its highly anticipated finale. The show's success has always hinged on the incredible versatility and chemistry of its cast, a group of stand-up comedians and writers who have masterfully blended vulgarity with genuine heart.

The final season promises to tie up the storylines of the now-iconic middle schoolers and their accompanying emotional creatures, making the complete and updated list of the Big Mouth cast more relevant than ever. From the multi-talented creator and star Nick Kroll to the historic recasting of Missy Foreman-Greenwald, understanding the voice behind the character is key to appreciating the show's unique blend of cringe comedy and emotional maturity. Fans are eager to see how the main cast, alongside a star-studded roster of guest voices, will navigate the show's final moments.

The Core Voice Cast: Full Character & Actor Profiles

The success of Big Mouth lies in its ensemble cast, many of whom are known for their stand-up comedy and writing careers. This core group has remained largely consistent throughout the series, creating the show's signature dynamic. The following is a complete profile of the main voice actors and the characters they bring to life in the final season:

  • Nick Kroll: Kroll is the co-creator of the series and voices a multitude of characters. His main roles include Nick Birch, the show's co-protagonist; Maury the Hormone Monster, Andrew's sexually-charged guide; Coach Steve, the lovable, dim-witted gym teacher; Lola Skumpy, the aggressive, lisping classmate; and Rick the Hormone Monster, an older, less competent monster.
  • John Mulaney: A longtime friend and collaborator of Kroll's, Mulaney voices Andrew Glouberman, Nick's best friend and co-protagonist, who struggles with severe anxiety and a hyperactive libido. He also voices various minor characters.
  • Jessi Klein: Klein voices Jessi Glaser, a cynical, intelligent girl whose early-onset puberty causes her to deal with complex family issues and self-image struggles.
  • Ayo Edebiri: Edebiri voices Missy Foreman-Greenwald, a biracial, half-Jewish, half-Black teen who is initially portrayed as a quirky, naive bookworm but later begins a journey of self-discovery and racial identity. Edebiri also joined the show's writers' room.
  • Maya Rudolph: Rudolph is the voice of Connie the Hormone Monstress, the main female Hormone Monster, who is Jessi's guide. She also voices Diane Birch, Nick's mother, and various other characters, earning her multiple Emmy Awards for her work on the show.
  • Jason Mantzoukas: Mantzoukas voices Jay Bilzerian, a sex-obsessed, chaotic, and often neglected classmate who is constantly experimenting and living in squalor.
  • Fred Armisen: Armisen voices Elliot Birch, Nick's well-meaning but oblivious father, as well as the Ghost of Duke Ellington and many other minor characters.
  • Andrew Rannells: Rannells voices Matthew MacDell, the flamboyantly gay student who becomes a more central character over the seasons, navigating his coming out and relationships.

Beyond the main cast, the series features other recurring voice talent, including Jordan Peele, who voices the Ghost of Duke Ellington and other entities.

The Ethical Recasting: Why Ayo Edebiri Replaced Jenny Slate as Missy

One of the most significant and talked-about developments in the Big Mouth cast history was the recasting of the character Missy Foreman-Greenwald. This change, which took effect mid-way through Season 4, was a pivotal moment for the show and a reflection of a larger cultural conversation about representation in animation.

Originally, Missy was voiced by actress and comedian Jenny Slate, who is white and Jewish. Missy is canonically a biracial character, with a Black father and a white, Jewish mother. In June 2020, Slate publicly announced her decision to step down from the role, stating that "Black characters on an animated show should be played by Black people."

The show's creators, including Nick Kroll, supported the decision, noting that the recasting was a necessary step towards authentic representation. The role was then taken over by Ayo Edebiri, a Black comedian and writer who had already joined the Big Mouth writers’ room. Edebiri officially took over the voice acting duties in the penultimate episode of Season 4, a transition that was cleverly woven into the show's narrative as Missy began a journey of self-discovery regarding her racial identity.

Edebiri's casting brought a new dimension to Missy, allowing the character to explore her "Blackness" in a more authentic and nuanced way, a move that critics praised for demonstrating the show's commitment to evolving with its audience and the cultural landscape.

The Final Season's Star-Studded Guest List and Supporting Entities

As Big Mouth heads into its eighth and final season, the show is pulling out all the stops, not only to conclude the main characters' stories but also to feature an incredible lineup of guest stars. The show has always been known for its cameo appearances, often featuring celebrities playing themselves or lending their voices to various Shame Wizards, Depression Kitties, Anxiety Mosquitos, and other personified emotions.

The final season promises to be no different, with Netflix announcing a massive list of over 25 guest stars set to appear. These high-profile additions ensure the final episodes are packed with fresh, unexpected comedic talent.

Notable Guest Stars Confirmed for Big Mouth Season 8:

  • Cynthia Erivo: The Tony and Grammy Award winner will lend her voice to an undisclosed role, bringing her dramatic and musical talent to the animated comedy.
  • Holly Hunter: Known for her acclaimed film roles, Hunter’s presence suggests a significant, possibly dramatic, new character to challenge the kids.
  • Steve Buscemi: The veteran actor is set to bring his distinct voice to the final season, likely in a role that is as bizarre and memorable as the show’s established supporting cast.
  • Megan Thee Stallion: The rapper is confirmed to appear as herself, continuing the show's tradition of integrating real-world celebrities into the chaotic world of puberty.

These guest stars join the already deep roster of recurring supporting voice actors who play the parents, siblings, and other students, including Paula Pell (Barbara Glouberman), Richard Kind (Marty Glouberman), and Maria Bamford (Tito the Anxiety Mosquito). The show's ability to attract such high-caliber talent, even in its spin-off series Human Resources, is a testament to its cultural relevance and critical acclaim. The final episode of the series is titled “The Great Unknown,” hinting at the characters' uncertain but hopeful future beyond middle school.

Topical Authority: The Big Mouth Universe and Its Impact

The Big Mouth cast has created a universe that extends far beyond the halls of Bridgeton Middle School. The show’s success paved the way for the spin-off series, Human Resources, which focuses entirely on the world of the emotional creatures—the Hormone Monsters, Shame Wizards, Lovebugs, and Logic Rocks. This expanded universe further solidifies the topical authority of the core cast, as many of the main voice actors, including Nick Kroll (Maury) and Maya Rudolph (Connie), reprise their roles and serve as the foundation for the new show.

The final season of Big Mouth is not just an ending; it’s a culmination of years of groundbreaking storytelling about the often-shameful and confusing experience of growing up. The voices of Kroll, Mulaney, Klein, and Edebiri have become synonymous with the raw, uncensored exploration of adolescence, tackling sensitive subjects like sexuality, mental health, and identity with a unique blend of humor and compassion. The legacy of the Big Mouth cast will be defined by their willingness to be the voices of a generation struggling through puberty, making the final season a must-watch event for fans worldwide.

The Final Bow: Every Major Star and Surprise Guest in the Big Mouth Season 8 Cast
big mouth cast
big mouth cast

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