This season in the series finds"leaf gobblers" eating all the vegetation in Great Valley, driving Littlefoot, the young brontosaurus, and the other dinosaur inhabitants outside. Arguments break out among the adults during migration, also Littlefoot and his friends opt to take things in their hands by crossing on the"big water" into an unknown island. There they meet with an old friend from The Land Before Time II--Chomper, the T-rex, who must safeguard the gang by their own, carnivorous parents. As the show has been wont to do from the beginning, and Loads of play in this particular one, it shows girls as less than perfect.