rugged david innes ( solid doug mcclure ) and doddery dr. abner perry ( a delightfully dotty peter cushing ) drill their way into the earth core in their spiffy mole machine . the duo discover an ancient prehistoric world populate by dangerous gigantic beast and human being who be use a both food and slave by evil telepathic pterodactyl men . director kevin conner and work from a blithely silly script by milton subotsky and maintain a constant brisk pace throughout and treat the exceptionally foolish premise with astonish seriousness and thereby give this picture a certain clunkily earnest quality that amuse and endear in equal measure . the lovably hokey ( not so ) special effect be quite ( unintentionally ) funny . the cheesy array of cut price creature in particular be positively sidesplitting represent cruddy guy in obvious shoddy rubber suit pterodactyl men and equally rinky dink savage ape man brute and and a hilariously ludicrous fire belch frog thing who blow up real good . one gut bust highlight occurs when mcclure mix it up with a fat and clumsy giant reptile . another priceless scene depict a dinosaur clutch a doll in it slavering jaw . moreover and we also get some rouse roughnready fisticuffs and an exciting climactic slave revolt . it a total treat to see cushing gleefully ham it up in a rare broad comedic part and become an unlikely and but enthusiastic arrow sling action hero in the last third of the flick . the ever luscious caroline munro look positively yummy a the fetching princess dia and plus there be nice support turn by cy grant a gallant warrior ra and sean lynch a treacherous coward hoojah . mike vickers neatly vary score alternate between jaunty orchestral music and wonky drone synthesizer stuff . alan hume crisp cinematography add a glossy sheen to the infectiously inane proceeding . a complete campy riot .