Wu Sung and Parrot King set out to find strong herbs and avoid an outbreak of dental problems at Big Green. In their search, they come across the Great Wall Train of the Tiger Tribe and must act quickly to rescue the humans being taken captive and forced to run the train. First Squad is called into the battle and must now face off against the Tiger Kings using diabolos and shooting yo-yos. Mighty Ray, Mystique Sonia and Jumpy GhostFace fight the Tiger Kings while Lin Chung uses the Crab King to help stop the Tigers' powerful train. Unfortunately, the train takes everyone forward in time until they are old and everyone must work together and figure out how to get back to present day.