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The Return Of Diesel 12 is a fan-fiction Thomas the Tank Engine and Friends movie.
Diesel 12 has returned and captured Percy. It's up to Thomas and Diesel 10 to defeat Diesel 12 and save Percy.
- Diesel 10
- The Fat Controller (mentioned)
- Diesel 12
- Ten Cents (from TUGS)
- Sunshine (from TUGS)
- Boomer (from TUGS)
- Narrated by Pierce Brosnan as Thomas (Narrator).
- Second (and final) apperence of Diesel 12.
- When Diesel 12 falls off the old viaduct, a moth is visible under his claw.