As Bojack is forced to attend an underwater movie festival to promote his new movie, a series of events and the inability to communicate with underwater life ensures that not everything goes as planned.
Bojack runs off to New Mexico to reconnect with an old friend, only to find she's happily married with a family. After staying longer than planned, Bojack makes another life mistake.
BoJack goes off the grid and winds up at his grandparents' dilapidated home in Michigan where he reflects on his family legacy and befriends another soul haunted by the past.