Thomas Helps Hiro is a book in the Engine Adventures series.
When Thomas causes Hiro to have an accident, he has to go and find his friend some new parts. But Thomas ends up wheel-deep in trouble himself.
- Sir Topham Hatt
- Percy (does not speak)
- Rocky (does not speak)
- Edward (mentioned)
- This book is based on the nineteenth season episode, Helping Hiro.
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