Mad Science and Monsters

First it is earthquakes, then missing animals, dogs, goats, horse, livestock.  Then it is missing persons and a teen.  Then it is suspicion what happened to the animals and who did it.  Then there is an attempt to hide what it could be behind the missing persons with another explosion.  Two teens reveal to the Chief of police what they saw.  Then a guard at the ruins comes up missing.  One link to another leads the Chief to a local professor of Entomology, bugs.  The professor discovers what kind of Monster it is.  There are Kaiju that can  be big or small.  Then there are the two- legged type.  Dugwood faces the big kind that threatens to eat everyone, and the two-legged kind tries to nuke Dugwood to hide the fact they are behind the research.
Then there are Teen Hero's, who save lives.