This time, while building a hideaway in their new home of the Great Valley, Littlefoot and the gang rescue a mysterious egg from two scheming egg-nappers and make a starling surprise - and new friend - when the egg hatches.

In need of funds for research, Dr. Alan Grant accepts a large sum of money to accompany Paul and Amanda Kirby on an aerial tour of the infamous Isla Sorna. It isn't long before all hell breaks loose and the stranded wayfarers must fight for survival as a host of new -- and even more deadly -- dinosaurs try to make snacks of them.