Arena, determined to face off against her mentor, finds herself running from deadly agents and her fellow students when her grandfather puts a bounty on her head.
When the three big trains refuse to go up the mountain in the deep snow, the Little Red Train finds brave helpers and goes on a rescue mission to take food to the stranded villagers.
Thomas and Gordon like to compete to see who is the faster engine; but when Thomas transports a jet engine to the airport, he gets an extra boost of speed when the engine is accidentally switched on.
While waiting for the man with the yellow hat to buy train tickets, Curious George causes trouble by mixing up numbers on the schedule, but he makes up for it when a little boy's toy rolls toward the tracks.