A Horse Walks into a Rehab

Will Arnett

BoJack Horseman / Butterscotch Horseman (voice)

Aaron Paul

Todd Chavez / AA Bird / Donkey Kid / Skippy (voice)

Alison Brie

Diane Nguyen / Vincent Adultman / Kevin / Samantha The Food Critic / Olivia / Joelle Clark / Otter / Cow Waitress / Sarah Lynn's Assistant / Ship Co-Captain / Golden Snowflake Announcer / Nurse / Waitress / Cow Waitress / Announcer (voice)

Amy Sedaris

Princess Carolyn / Sharona (voice)

Paul F. Tompkins

Mr. Peanutbutter / Marv / Virgil Van Cleef / Prescott / Andrew Garfield / Sandro / Dog Valet / Underwater Man / Concerned Man / Janitor / Bartholomew Scagsworth / Sloth Lawyer / Blimp Co-Pilot / Abortion Doctor / George Tickle / Giant Chocolate Oscar Guy / Actor #2 / Bird / Willie Wesleyan (voice)

Kiersey Clemons

Jameson H. (voice)

Cindy Crawford

Cindy Crawfish (voice)

Jay Hernandez

Jay Hernandez (voice)

Tim Meadows

Jameson's Father (voice)

Jeanne Tripplehorn

Jeanne "Joan" Tripplehorn (voice)

Will Choi

Pastiches Receptionist (voice)

Sam Richardson

Doctor Champ (voice)

Stanley Tucci

Herb Kazzaz (voice)

Cedric Yarbrough

Officer Meow-Meow Fuzzyface (voice)

Raphael Bob-Waksberg

Sarah Lynn's Stepfather (voice)