Spencer's Promise is the 57th episode of Big City Engine the Tender Engine and Friends and the 2nd episode of Season 3.


  • Big City Engine as Thomas
  • Spencer as Percy
  • Farnsworth (from The Little Engine That Could) as Edward
  • The Shiny Engine (from The Little Engine That Could (Book)) as James (Cameo)
  • Tiger Moth as Harold
  • Zoe and Zodiac (from TUGS) as Annie and Clarabell (Does not speak)
  • Humbert the Huntsman (from Snow White) as The Vicar of Wellsworth (Does not speak)
  • Stewie Griffin (from Family Guy) as Sir Topham Hatt


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