Without giving too much away, I have to say this is hands-down the best episode from start to finish. Full of tension, suspense, anticipation, creepiness, cool special effects, and a new location, this episode is light on action - yet seems to captivate the audience with anticipation, by letting the tension build up and slowly revealing what is going to happen at the end. The climax is startling, and certainly contains a couple of the best images that will be frozen in the minds of LOTL fans for a long time. The whole episode is like an emotional rollercoaster, with the climax being very tense throughout - starting out hopeful that there is a newly discovered way out of the LOTL, to disappointed, disturbed, and fascinated as to what really happens.
Right off the bat we know it's going to be a memorable episode. It begins with an earthquake which rattles the cave at High Bluff, awakening the Marshalls, and re-shaping certain landscapes in the Land of the Lost. Quickly after that, a strange apparition appears to Will and Rick, but we can't really tell what it is, other than some sort of human-like being. It appears again, floating in the air, and Holly sees it as well. Each time it appears, it gets clearer, until they all can see that it is a vision of Holly - a different Holly. The apparition is dressed differently, piqueing the interest of the entire family.
The ghostly version of Holly appears to want to say something, but words will not come out of her mouth. Everyone is entranced as to what in the world is going on. Then, the 'ghost' Holly enters the body of the 'real' Holly, and starts speaking. She is in distress about something, and needs the Marshalls' help. The rest must be seen to be believed.