Spencer and The Signal is the 36th episode of Big City Engine the Tender Engine and Friends and the 7th episode of Season 2.
- Spencer as Percy
- Bluenose (from TUGS) as Gordon
- The Shiny Engine (from The Little Engine That coul (Book)) as James
- Farnsworth (from The Little Engine That Could) as Edward (Cameo)
- The Freigth Engine (from The Little Engine That Could (Book)) as Henry (Cameo)
- Big City Engine as Thomas (Does not speak)
- Stewie Griffin (from Family Guy) as Sir Topham Hatt (Does not speak)