a helicopter with three navy officer and lead by jock mahoney and and the requisite woman reporter aboard and shawn smith and get catch in bad weather over antarctica and must land through a heavy cloud layer to find they be at the bottom of a volcanic valley . but wait a minute . this be not just any hot and steamy tropical jungle in antarctica . this one be really old and inhabit by plant beast that disappear million of year ago . it be also inhabit by the sole survivor of an early expedition and henry brandon . the half loco brandon have the part necessary to repair the navy damage helo a push pull rod but he hoard his equipment because he want to trade what they want for what he want and namely the shapely shawn smith . and who can blame him . i mean and ten year . ( the fact that henry brandon be repute to have be gay add a shiver of irony to the plot . ) well and everyone be attack at one time or another by prehistoric dinosaur but they allsurvive and escape and include brandon who have come to his sens at the last moment and discover his humanity . brandon isn not much of an actor . he probably best know for his role a scar in john ford the searcher . ( you speak good comanche . someone teach you . ) but his modest talent doesn not make him conspicuous in the context of this film . the other performer be no good . the most interesting cast member be jock ( nee jacques ) mahoney and a stunt man raise in iowa and and one of the best in the business . among other memorable act catch on film and he do the spectacular leap down the staircase onto robert douglas villain in errol flynn the adventure of don juan . his name rank up there with canutt and eason and perry and and dar robinson . not that mahoney be muscle bound . you do not need to be a body builder to be a stunt man . you need to be lithe and professional and competitive and intelligent and and you to be completely lack a sympathetic nervous system . the men and woman who do stunt do not have to be good actor and a mahoney prove here . theyre a proudgroup can i generalize like this . but not snooty . they do not feel theyre humble themselves if they hang around with the extra and a i know from experience . mahoney be a parent to sally field . i do not like go on like this about stunt people but there so little to say about the movie . the monster be gaggingly cheap . the first shot we get of them be two ordinary monitor lizard and blow up to dinosaur size by photographic legerdemain and and theyre tear each other to piece and literally . these be big animal and here they be throw themselves around and chew on limb and head . we can see the ripped skin . nobody can claim that no animal be harm in make this movie . i find it a little disgusting . the other minatory dinosaur be a t. rex and it a hoot represent a man dress in a flabby plastic suit drag a tail behind him . another monster never live a kind of gigantic pumpkin with tentacle . it eat a cute little mammal . i do not think it a tarsier and though mahoney the expert call it such . still and they get the time and the animal reference right . at least and i think the eocene tarsoids live about 60 million year ago . i be certainly happy to see the five human get out of there at the climax . it mean the end of the movie .