- Hazel Grace Lancaster as Emily
- Augustus Waters as Thomas
- Isaac as Sir Topham Hatt
- Frannie Lancaster as Bridget Hatt
- Michael Lancaster as Stephen Hatt
- Patrick as Edward
- Lidewik Vligenthart as Mavis
- Peter van Houten as James
- Mrs. Waters as Rosie
- Mr. Waters as Henry
- Dr. Maria as Daisy
- Monica as Henrietta
- John Green as Hiro (cameo)
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