In the present, artist Tom Warshaw recalls his traumatic coming of age. As a 13-year-old growing up in New York City in 1973, Tom hangs out with Pappass, a mentally disabled man. With Tom's mother battling depression after the death of her husband, the young boy is left to his own devices. When Tom develops a crush on schoolmate Melissa, Pappass feels abandoned and begins behaving erratically.
Anton Yelchin
as Tommy
Téa Leoni
as Mrs. Warshaw
David Duchovny
as Tom Warshaw
Robin Williams
as Pappass
Erykah Badu
as Lady / Bernadette
Frank Langella
as Reverend Duncan
Magali Amadei
as Coralie Warshaw
Claire Lautier
as Madam Chatquipet
Zelda Williams
as Melissa Loggia
Bernie Sheredy
as Sasha
Olga Sosnovska
as Simone
Mark Margolis
as Mr. Pappass