One morning in the Land of the Lost, a volcano errupts and molten green lava is headed toward the Porters' treehouse. Tom Porter assigns responsibilities of packing and moving to each family member. Kevin - thinking mostly of himself - decides this task is too trivial for a cinematographer, and sets out to film some "live action" with his camcorder.

While filming, Kevin is trapped by Scarface in a desserted underground chamber. The chamber is also guarded by an ancient Sleestak power crystal. Unfortunately, Kevin needs help to escape, but since no one knows where he is, he seems trapped.

Kevin quickly learns that his needs do not always come first, and that team work is the key to survival.