Littlefoot and the gang meet a shy newcomer, Ali, but the pleasantries stop there. There's a dire environmental theme to this third sequel in the series, in which the world's weather changes beyond the Great Valley, and what had been dry land is now a "land of mists." The shift brings new creatures who push out older inhabitants, and Littlefoot sees these radical changes for himself when he has to venture into the area to find a medicinal flower for his sick grandfather. While the animation is slow and contained the way direct-to-video cartoon releases often are, the story is sound and the now-familiar characters are memorable.

In search of some adventure in their safe and peaceful valley, the five dinosaur friends make a hideaway. From there, they spot two thieves in action, stealing an egg from one of their broods. They chase them down and manage to recover the egg without its parents noticing, but in the process, accidentally create an opening into the valley, allowing two dreaded Sharptooths in. Everyone must fight them off together to preserve their peaceful way of life. Written by Cynan Rees

Littlefoot and his friends are constantly being bullied and browbeaten by three teenage dinosaurs: Hyp, a Hypsilophodon; Nod, a Nodosaurus; and Mutt, a Muttaburrasaurus. However, when a shower of meteorites (flying rocks) impacts near the Great Valley and causes a rock slide in the Mysterious Beyond, which blocks the water supply of the Great Valley, Hyp, Nod, and Mutt are no longer the biggest worry of Littlefoot and his friends. The increasing lack of water causes conflicts between the inhabitants of the Great Valley, who have lived in relative peace and harmony until this event.