Ants Become Giant Spiders to Fight Dinosaurs! - Dinosaur VS Spider Evo

It starts with a couple of tiny ants fighting dinosaurs. They're obviously not going to do much damage at that size, so after every loss, they get upgraded into a different creature. The later versions get pretty weird. One has long spider legs, another has huge claws, and the last one is a massive Broodmother. The dinosaurs stay as their opponents throughout the experiment. The whole idea is to keep upgrading the ants after they lose and see how far the final evolution can get.