- Hazel Grace Lancaster as Tickety Tock
- Augustus Waters as Slippery Soap
- Isaac as Steve
- Frannie Lancaster as Mrs. Pepper
- Michael Lancaster as Mr. Salt
- Patrick as Joe
- Lidewik Vligenthart as Blue
- Peter van Houten as The Green Puppy
- Mrs. Waters as Orange Kitten
- Mr. Waters as Mailbox
- Dr. Maria as Magenta
- Monica as The Viewer
- John Green as Cash Register (cameo)
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