•
David Harbour as David Harbour III, an actor investigating the life of his father, David Harbour Jr. • Harbour also plays David Harbour Jr., an eccentric actor who portrayed
Dr. Frankenstein in the play ''Frankenstein's Monster's Monster, Frankenstein'' •
Alex Ozerov as Joey Vallejo, a deceased movie star who portrayed Sal in the play •
Kate Berlant as Monica Fulton, an actress who portrayed Miss Macbeth in the play •
Mary Woronov as Nancy Erlich, the producer of the play •
Alfred Molina as Aubrey Fields, a legendary actor and television host who portrayed the sea captain in the play •
Heather Lawless as the doctor in the play •
Michael Lerner as Bobby Fox, Harbour Jr.'s former agent •
Marion Van Cuyck, the Frankenstein's niece in the play •
Bridey Elliott as a reporter who interviews Harbour Jr. •
O-Lan Jones as Frankenstein's mother in the play •
Lidia Porto as a detective hired by Harbour III to investigate his father • Graham Wagner as Graham, a
dramaturge hired by Harbour III as a personal assistant • Randolph Thompson as a forensic accountant hired by Harbour III to investigate his father ==Reception==