Plot: After the Great Valley is left in a state of devastation, Littlefoot and his friends, along with their families, must travel into the Mysterious Beyond to find food. When the threat of separation becomes immanent, the gang take matters into their own hands and discover a lone island, where they reunite with an old friend...Chomper.
Alternative Plot: A plague of locusts strikes the Great Valley, decimating the plants and forcing the dinosaurs to migrate in search of food. When the adults in the herd begin fighting over the scarce resources, young Littlefoot and his friends Petrie, Cera, Ducky and Spike split off from the main group, becoming stranded on an island after their path was destroyed by a tsunami. As they search for a way off the island, they encounter an old acquaintance who may become friend or foe.
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