'Monstroid' aka 'Monster' (1978) - Kenneth Hartford & Herbert L. Strock.

This visibly penurious, enjoyably creaky creature feature, not unsurprisingly, stars gaunt B-Movie icon John Carradine, alongside, Phil Carey, with big, Jim Mitchum playing amiable Alpha monster slayer, Travis with a notal lack of zeal! Like fellow agitprop eco-shocker 'Slithis', the lumbering 'Monstroid' takes broad potshots at the cavalier approach big business has to their chemical waste disposal. The US owned concrete processing plant in a sleepy Columbian village has been blithely pumping dinosaur DNA making gloop into the local water supply. The soapy melodramatics, prosaic chatter, goofy monster gorings, and rudimentary practical FX all guarantee that no truly warped lover of cornball 70s creature features shall feel aggrieved by the conspicuous cheapnis of 'Monstroid'. The climax remains outstandingly ridiculous, and yet, the winningly absurd sight of swarthy Spaghetti western icon, Aldo Sambrell enthusiastically whizzing about in a speed boat in order to subdue the distempered behemoth has a screwball charm all of its own!