Cristin Milioti as Hazel Green
Billy Magnussen as Byron Gogol
Ray Romano as Herbert Green
Dan Bakkedahl as Lyle Herringbone
Noma Dumezweni as Dr. Fiffany Hodeck
Caleb Foote as Bennett Hobbes
Sarunas J. Jackson as Jay
Oona Chaplin as Alice
Chris Diamantopoulos as Agent Hank Walsh