Ali's herd returns to the valley, and a new dinosaur named Rhett claims sharptooth's fear him, so the gang decides to bring in Chomper to see if he is a liar.
The gang tries to find someone who can help explain why Chomper has lost a tooth to see if it's normal.
While trying to learn how to fly Guido is blown into a cave with Petrie, and they encounter a blind old flyer called Swooper.
Cera accidentally loses Tria's shiny stone, so the gang travels to the Canyon of Shiny Stones looking for a new stone to replace the lost one.
Everyone except Cera and her father are excited for the bright circle celebration, but when fire threatens everyone only Cera and her father can save the day.
Doc returns to the great valley, in search of a lady friend. But when he finds out Littlefoot is friends with a sharptooth, their friendship gets strained.