- Hazel Grace Lancaster as Lanolin
- Augustus Waters as Orson
- Isaac as Bo
- Frannie Lancaster as Lenore
- Michael Lancaster as Nermal
- Patrick as Odie
- Lidewik Vligenthart as Arlene
- Peter van Houten as Jon Arbuckle
- Mrs. Waters as Chloe
- Mr. Waters as Garfield
- Dr. Maria as Penelope Pussycat
- Monica as Liz Wilson
- John Green as Wade (cameo)
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