Adam Arkin as a Springfield, Missouri detective who tracks down Gypsy and Nick in Wisconsin and interviews Gypsy after her arrest.

John Ales as Vance Godejohn, Nick's father.

Juliette Lewis as Kathy Godejohn, Nick's mother.

Rhea Seehorn as Janet, Dee Dee's cousin.

Margo Martindale as Emma Blanchard, Dee Dee's mother and Gypsy's grandmother.

Brooke Smith as Myra, Dee Dee's attorney.

Joe Tippett as Scott, Gypsy's older love interest whom she met at a comic book convention in 2011.

Dean Norris as Russ, a man who was attracted to Dee Dee in 2011.

Denitra Isler as Shelly, a neighbor who is close to the Blanchards, Mel, and Lacey.

Calum Worthy as Nick Godejohn, Gypsy's boyfriend who murders Dee Dee under Gypsy's order so they can be together.

Chloë Sevigny as Mel, Lacey's mother who is an original character in the show based on Amy Pinegar.

AnnaSophia Robb as Lacey, an original character in the show based on Aleah Woodmansee.

Joey King as Gypsy Blanchard, Dee Dee's daughter and Emma's granddaughter.

Patricia Arquette as Dee Dee Blanchard, Gypsy's mother and Emma's daughter.

The narrative eventually leads to murder after Gypsy asks her boyfriend to kill her mother. At the time, this disorder was classified as Munchausen syndrome by proxy, by which it is still commonly known. It is suggested that she suffers from factitious disorder imposed on another, a mental illness in which a caregiver exaggerates or fakes another person's illness. Her mother Dee Dee successfully deceived not only Gypsy but also her family, friends, and medical professionals into believing her child was ill. She grew up believing she was sick with cancer but discovers that she was not sick at all. The relationship turns even more toxic as Gypsy discovers many secrets. She rebels as her mother, who dedicated her life to her care, grows more protective, controlling and abusive, particularly amid her attempt to explore her sexuality. Growing up, her relationship with her overprotective mother ( Patricia Arquette) begins to sour as she increasingly insists on her independence. The series follows the story of Gypsy Blanchard ( Joey King), who uses a wheelchair due to an illness.

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