20-something James Pope (Saturday Night Live’s Kyle Mooney) lives with Ted (Mark Hamill) and April Mitchum (Jane Adams) in their compound, forbidden to leave because of the poison air he’s been told is outside. He spends his hours watching and studying the TV show Brigsby Bear. Suddenly, the FBI raids the place, and James learns that he was kidnapped as a child. It turns out that everything outside is actually fine, and Brigsby Bear was created by Ted and shown only to James. Returned to his real family, James has a hard time adjusting — he can’t forget his lifelong obsession with the bear. After his father takes him to the movies, James decides to make his own film, wrapping up the Brigsby Bear storyline. He goes to a party with his sister and makes some new friends who are willing to help. Unfortunately, the authority figures in his life think that James’ obsession is unhealthy and that he should be sent somewhere to get help.