Forest ranger Rick Marshall and his two kids, Will and Holly, are on a routine expedition when they're swept into an alternate universe known as the Land of the Lost. There, they must learn to survive in a strange new world inhabited by strange monkey people, dangerous giant lizard-like creatures, and massive earthlike dinosaurs while learning to master mysterious Pylons, which may be the key to finding a way home.
An earthquake shakes things up in more ways than one, changing the landscape and bringing about yet unseen dinosaurs into the Land of the Lost, while Rick Marshall disappears through a time doorway.
By manipulating solar-controlling crystals, the Sleestak caused the Marshall's water supply to dry up. Can the help of a mysterious solar repairman be enough to make things right again?
Torchy, a fire-breathing and poisonous dinosaur, injures Will. His fate hangs in the balance as Enik refuses to reveal the antidote until the family rids the valley of these pesky creatures.
A balloonist from the early twentieth century drops in on the Marshalls, who hope to fly with him back to their time. However, the balloonist has ideas to bring Cha-Ka back to his time to exploit him.
The Marshalls find a time plaque that might provide the key they need to escape from the Land of the Lost, yet Enik is the only one who understands how to use it. Can Enik help the Marshalls unlock the secret of this ancient Altrusian artifact?