After Thomas and Percy get spooked by a suspicious rumbling, the engines set off to figure out the secrets of the old mine inside Lookout Mountain.
Sound
Whistle sound effects that haunt my dreams.
Director
Campbell Bryer
Trivia, insights & behind the scenes
This was the first Thomas feature with fully CGI humans, ending the model railway era forever. RIP practical effects.
The franchise rebooted in 2021 with 'Thomas & Friends: All Engines Go,' making this part of the controversial 'baby-fied' era that divided train Twitter.
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