Flight of the Dino-Master!
I’m sure that the plan we’re about to talk about kind of worked on paper: after all super-villains are always creating all sorts of things or creatures that they’d then use to get revenge, take over the world, or become rich. So when Dino-Master (real name: Herbert Grant, verified Mad Scientist who managed to slip through the high school guidance counseling process) figured out how to create a Devolvo-Ray that would turn reptiles and birds into dinosaurs, he thought that he had something hot, here. Convert a zoo, have a rampage, everything would be great.
And it worked! He even managed to solve the mass problem (turning a chicken into a full-sized T-Rex is gonna require some special Mad Science, right there) with a handy protein slurry gun. So, all of a sudden, the countryside’s full of dinosaurs, ready to rampage! …Only, they’re not.