Clemons has previously starred in Dope and made guest appearances on Angie Tribeca and Transparent. In BoJack Horseman, she voices the character Jameson, per the A.V. Club, whom the protagonist meets in rehab.

In Episode 1 of this new season, the iconic supermodel plays an undersea version of herself, Cindy Crawfish.

Marcia Gay Harden has been in everything from Mystic River to the Fifty Shades of Grey trilogy. Here, she brings her acting to animation with a character in BoJack Horseman Season 6.

Viewers may recognize Richardson as Richard Splett from Veep, Sam Duvet of the tragically canceled Detroiters, or even the Baby of the Year Host from I Think You Should Leave. In Season 6 of the animated series, Richardson plays BoJack's rehab therapist, Doctor Champ.

Meadows is a comedian known for his roles in Mean Girls and Saturday Night Live. In Season 6, he voices Jameson's father, who collects movie memorabilia for a sad reason.

Tucci has played Herb Kazzaz and Mr. Liberatore in the Netflix series, the former of which he reprises this season.

The Mamma Mia! actor returns to her role as Manatee Fair reporter Amanda Hannity in BoJack Horseman.

The Wicked star again plays Princess Carolyn's professional nemesis, Vanessa Gekko.

The Empire creator and The Butler director voices a version of himself named Flea Daniels. The filmmaker becomes fed up with Mr. Peanutbutter when he gets overly involved with the editing process for his new project, Birthday Dad.

In Episode 2, the Kick-Ass actor plays herself in Flea Daniels' next project, The Diary of Anne Frankenstein. The director describes it to Princess Carolyn as, "A sensitive, coming-of-age movie about a young girl in hiding, built out of the reanimated corpses of other young girls in hiding."

Moretz plays a zombie who says, "In spite of everything, me still believe people good, fire bad!"

Oswalt returns this season as the anxiety-riddled book editor Pinky Penguin.

Barbaro hosts the New York Times podcast The Daily, which is why the voice on Diane's ringtone this season may sound so familiar.

The Get Out and Sorry to Bother You star plays Guy, a cameraman who starts dating Diane while they're on the road with Girl Croosh — sorry, Content Spew.

Condor made her debut in the Netflix movie To All the Boys I've Loved Before, and here voices an assistant named Casey.

Swank's prolific career took off in 1997 with a character arc on Beverly Hills, 90210. Since then, she's starred in films like Million Dollar Baby and Boys Don't Cry, both of which granted her Oscar wins. In BoJack Horseman, Swank gets to flex her voice acting muscles by playing the Justin Bieber stand-in Joey Pogo.

Booster recently played Jun Ho on NBC's comedy Sunnyside, but he's also no stranger to voice acting, having played Charles Lu in Big Mouth Season 3 before joining the ranks of BoJack this year. In the animated Netflix series, Booster plays an airport employee who hits on Maude, the Cinnabon cashier.

This comedian is best known for her comedy podcast 2 Dope Queens and ensuing HBO series. And after starring in the Netflix movie Ibiza, Robinson voices Dean Squooshyface in BoJack, who offers the horse-man a teaching job at Wesleyan.

Nancherla has played small parts in Master of None, High Maintenance, and the Paul Feig movie A Simple Favor. Here, she plays the protagonist's nervous half-sister, Hollyhock, who grapples with whether to start drinking or not this season.

The Whiplash actor voices Lenny Turtletaub, a Hollywoo producer who helps Princess Carolyn deal with the assistants' decision to unionize in Season 6, Part 1. Simmons also plays the horse preacher at Old Town Horseberg, which BoJack visits in Episode 7.

Though he's best known for his iconic song parodies, Yankovic occasionally acts, too. He's appeared in Crazy Ex-Girlfriend, Drunk History, and Lady Dynamite, among others. In BoJack Horseman, he plays Mr. Peanutbutter's brother, Captain Peanutbutter.

Before Bamford's Netflix series, Lady Dynamite, she was best known for voicing characters on everything from Adventure Time to the 2006 animated movie Barnyard. So it seems only natural for her to be in BoJack, where she's played several characters in previous seasons. This time around, she reprises her role as director Kelsey Jannings, who's in talks to direct a female superhero movie.

In a departure from Philip Jennings on The Americans, Rhys voices Juston Kenyon in the animated Netflix series — the director Kelsey Jannings (Maria Bamford) vents to on the lot.

He's best known for his over-the-top character Rogelio de la Vega in Jane the Virgin. Here, Camil plays Todd's stepdad, Jorge Chavez.

He may be best known for playing Schmidt in New Girl, but appearing in BoJack Horseman as The Hollywoo Reporter journalist Maximillian Banks shows Greenfield's range.

Root has appeared in comedies like Office Space, Dodgeball, and the HBO series Barry. In BoJack, he plays the villainous Jeremiah Whitewhale, who buys out Girl Croosh.

Martindale voiced herself in previous seasons, which she reprises in Season 6, Part 1.

Schwartz plays Rutabaga Rabitowitz — a smooth-talking agent who's always wearing an earpiece.

The Brooklyn Nine-Nine star reprises her character Gina Cazador, who was BoJack's costar on Philbert in Season 5 and has since moved on to other projects.

Fortunately, fans will only have to wait until Jan. 31 for BoJack Horseman Season 6 Part 2, when there will likely be even more celebrity cameos.

This post was updated with more character names on Oct. 29, 2019.