Attack of the Fifty-foot Panda!
…Yeah, that’s going to be problematical. For a bunch of reasons, really. And it’s going to be problematical for everybody, including the aliens that created this creature in the first place.
Probably the principle was sound enough: take some animal DNA, splice it into a weird biological plastic construct that could emulate said DNA at a ‘monstrous’ level, and send your new critter out to level Tokyo. And it works! And it’s even pretty cheap!