Along with King Kong this is one of the first films I remember seeing, on Saturday night TV sometime in the mid '60's. My expert judgement at 6 years old was that it was the best film ever made, over the years since it has somewhat slipped down my list but at least is still in it! Viewed through rose-tinted spectacles I still enjoy watching it and trot the vid out every 5 years or so for another wallow in personal nostalgia. Viewed dispassionately I think it's also better than both 1925 versions the long was too slow, the short unintelligible; forget any others.
Eccentric Professor Challenger challenges crusty Professor Summerlee in public to go with him on an expedition to find a plateau in South America where he (claimed) he saw prehistoric dinosaurs roaming around. A motley party is assembled to make the trip consisting of a cynical aristocrat with a secret, his eye-fodder girlfriend in pink and her eye-fodder brother, the hard working reporter who fancies her, and 2 dingy latins with plenty of secrets. A couple of hours after landing they discover
prehistoric dinosaurs roaming around partial to wrecking helicopters, and we discover Challenger appears rather challenged when coming to name them. Corn abounds, the special effects are worse than in 1925, every plot device is telegraphed ahead, and every racial, sexual and class stereotype is out in force but I love it just the same! At least Jill St. John didn't twist her ankle, and the sets weren't always cardboard though.
If you didn't see this when young and impressionable don't bother, however if you did and you're not a serious type it's worth a try. You still might be horrified but you might return to a lost world of safe family adventure movies.