Jill asks BoJack to retrieve a love letter from Cuddlywhiskers' house, but he and Diane find an orca stripper dead in his pool. The use of BoJack's name in her last text lead him and Diane to believe he is being framed for murder, but they learn that "BoJack" is actually the name of a brand of heroin being distributed by a former Horsin' Around star, which the stripper overdosed on. Todd and Mr. Peanutbutter get sprayed by a skunk and end up setting fire to Mr. Peanutbutter's yard while trying to fix it. BoJack and Diane find Cuddlywhiskers in a hut up in Ojai, where he explains that he gave up his material desires after he felt nothing when he won an Oscar and dedicated himself to helping addicts. He advises them to give up everything if they want to be happy, advice which makes them both uncomfortable.

BoJack attends a film festival in the Pacific Ocean, where he is forced to wear a helmet that prevents him from speaking and cannot understand the native tongue. He spots Kelsey there for her new film and writes a halfhearted apology note for getting her fired; however, he is swept onto a bus by a school of minnows and taken out of the city before he can deliver it. On the bus, BoJack watches a seahorse give birth and leave one of his babies behind. BoJack forms a kinship with the infant and tries to return it to its father, a series of hijinks leading them through the deep sea and a taffy factory. He eventually gets it home and turns down the father's offer of money, but is saddened when he realizes he cannot tell which of the children is the one he rescued. He returns to the city to find that Secretariat is a big success. After seeing Kelsey leaving, he writes a heartfelt note about connection and gives it to her, but is horrified to see the ink has dissolved as she leaves. A human annoyedly tells BoJack to get out of the way by pressing a button on his helmet, and BoJack realizes he could have talked the entire time.

Secretariat premieres publicly and is met with overwhelmingly positive reviews. BoJack and Todd celebrate at a hotel, where they bump into Emily, who is there for her best friend's rehearsal dinner. Sensing Emily's attraction to Todd, BoJack sets them up with a room so they can have sex, but Todd is again uncomfortable and leaves Emily alone. BoJack accidentally causes one of the brides to have doubts about her marriage, and he reinvigorates her by talking about his own feelings on love, which depresses him and leads him to have sex with a dejected Emily. Princess Carolyn goes on three dates; she finds the first two unsatisfying, but enjoys her third one with mouse Ralph Stilton. Diane does drugs with a client when he accidentally calls her to hang out with him. Returning home while high, Diane tells Mr. Peanutbutter that she loves him despite his eccentricities, and injures her wrist when she tries to carry him. At the hospital, Diane learns that she is pregnant.

Diane and Mr. Peanutbutter agree to get an abortion, and she accidentally tweets that she is getting one from a pop star's account while talking to BoJack. Princess Carolyn and the pop star embrace it when it gains her popularity and plan to fake an abortion on live television, which Diane is disgusted with until she realizes the star's music is inspiring young women getting their own abortions. The pop star actually gets pregnant and plans to keep it, and Diane and Princess Carolyn start plotting about how to handle it. BoJack fires Ana when he realizes she is working with all the other actors in talks for Oscar nominations. This arouses Ana and causes her to drop all her other clients and begin a sexual relationship with BoJack.

BoJack calls a newspaper that keeps delivering to his door despite trying to get it cancelled, and recounts recent events to the representative as she tries to convince him to keep it. Margo Martindale is revealed to have been hiding out in the Escape From L.A. and stealing food from his kitchen, and eventually takes the boat to flee from the law. Emily and Todd start a female cab service with all women drivers, but BoJack and Emily are visibly uncomfortable around each other, and she eventually leaves without explaining the problem to Todd. While looking at Secretariat ads, BoJack is captivated by a reflective one that reads "YOU ARE SECRETARIAT", but Ana is unable to get the producers to go through with it. Curious about her private life, BoJack follows her and finds that she is as lonely as he is, which disturbs him. The representative advises him to be direct with Ana, and he finishes the call without cancelling the magazine. He goes to her and firmly asks for the advertisement to be run, which results in a mirror billboard being put up on a highway that only reflects the sky.

Diane and Mr. Peanutbutter go to the Labrador Peninsula to be with his family for the New Year's, where Diane believes Mr. Peanutbutter's older brother is expressing distaste for her abortion when he makes several morbid statements about mortality around her. He reveals to Mr. Peanutbutter that he actually has a twisted spleen that requires surgery to fix, which worries him. BoJack is contacted by the actor who played his son on Horsin' Around, Bradley Hitler-Smith, who wants to do a sequel series about his character. BoJack is too nervous to directly turn him down, so Ana does it for him. Rutabaga Rabitowitz and Vanessa Gekko, having started their own agency together, compete with Princess Carolyn to land their horse actors in a new David Pincher movie. Princess Carolyn initially gains the upper hand through way of her past assistant, but they use Kelsey and the fact that Princess Carolyn held her assistant back to win the role, putting Princess Carolyn's agency in jeopardy. BoJack loses his chance to reconnect with Kelsey when Princess Carolyn tries to price him higher than Kelsey can afford.

BoJack convinces Sarah Lynn to break her sobriety and go on a bender with him. They binge Horsin' Around and go to her sobriety meetings, where he rambles about Penny before blacking out. Through a series of blackouts, he tries to make amends with all of the people in his life, including Ana, who tells him a story where the moral is that some people cannot be saved. He and Sarah Lynn drive to Oberlin to see if Penny is alright, but his appearance only distresses her after she seemed fine prior. BoJack and Sarah Lynn do BoJack heroin and watch her win an Oscar in a dingy motel room; Sarah Lynn admits that it does not make her happy and she hates her famous life. They go to the planetarium at her request, where BoJack promises her that things will be fine as she falls asleep in his arms and remains unresponsive.