Washed-up horse sitcom actor BoJack Horseman seeks to write an autobiography to reignite his fame, but is too lazy to do so, so his publisher assigns him a ghostwriter, Diane Nguyen. Initially unwilling to meet with her, he invites her to a quinceañera his slacker roommate Todd Chavez throws at his house to pay off a cartel, and is surprised to find that they connect. However, he learns that she is dating his longtime rival and fellow sitcom actor, dopey Labrador retriever Mr. Peanutbutter.