In the Alps, the Snowland monorail ends up being trapped in a mountain tunnel due to an avalanche. With a severe storm incoming in that area, the mountain authorities are unable to mount a recovery effort themselves and call in the Thunderbirds to rescue the train's passengers. Meanwhile, inside the tunnel, the tour guide Chrissie gets everyone safely away from the burning train and into the tunnel's shelter, where they wait for help. Dylan is sent into the tunnel to assess the situation, and finds that Chrissie and the passengers are fast running out of air due to the increasing smoke from the train. Unable to put out the fire, Dylan uses his spare oxygen to keep everyone going while the rest of the team attempt to get to the tunnel without causing another avalanche.
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