'Behemoth: The Sea Monster' (1958) - Eugène Lourié.

Something uncommonly strange is happening on the Cornish coast! Fish are dying out in their thousands and grimly beleaguered fishermen are suffering from the most hideously disfiguring radiation burns!!!?? It very soon becomes alarmingly apparent, impossible as it sounds, that a long-dormant prehistoric behemoth has tumultuously awakened from the blackened depths and is murderously making a hyper-destructive beeline for Britain's historical capital city!!! 

'Behemoth: The Sea Monster' is a radioactively hot B-Movie, replete with gorgeous gobbledygook verbals and such a calamitous cavalcade of scintillating stop-motion savagery, that no building, ship, electrical pylon, armed military roadblock or London bus could ever hope to withstand the ominous onslaught of this diabolically destructive, malevolently mutated sea monster! One of the more monstrously entertaining late 50s British Sci-fi street smashers is joyously blessed with a fabulous array of practical effects, a laudably low-key earnest performance from Gene Evans, and predictably solid work from sexy Hammer Films legend André Morell, as cool-headed prof. James Bickford, plus another cracking score from maestro Edwin Astley gives the catastrophic events some additional pep! 'The electrifying blood-spills and titanic thrills are dangerously out-sized in 'Behemoth: The Sea Monster'! This recklessly rampaging, radiation-spewing subaquatic super-beast makes Godzilla look like a arthritic aardvark in rubber safety pants!

'Look out London!!!!! This long-necked, nuclear-powered dinosaur is about to make you extinct!!!'