Thunder Of Gigantic Serpent

What would you do if you were a 300 foot long serpent and someone threatened your only friend? For the Mosler the only answer is KILL.
A power hungry gangster tries to steal a secret formula which can stimulate plants and animals to grow up to 300 times their normal size. But when the raid goes wrong the formula falls into the hands of a little girl, who feeds it to her pet snake, Mosler! Pursued by vicious gangsters, the military and elite commandos, the girl finds protection from the giant serpent as it rampages through the city.