The Jaegers of Pacific Rim
Pacific Rim is all about fighting the creatures from other dimensions and save humanity from their invasion. Jaeger is a transporting machine that helps the traveler to get to different universes. It requires two co-pilots to establish connectivity in the neural pathways. Both the pilots have to work together to coordinate the movements of Jaegers. Three-legged races shown in the movie were called Kaiju and Jaegers were made to destroy them. It is quite hard to tame down such ferocious sea creatures with an enormous machine that is even hard to manage. Technology will change the way we fight wars, but probably not like that.
Such machines are not reliable to attack or even fight a real, deadly creature. Being controlled by humans, it is vulnerable to attacks from animals. Nothing of such kind has been reported in real life. Still, there are reports that a computer science and engineering professor in Texas is developing robots that are more powerful than the Jaegers. Though there is not much information regarding this technology, they will be tiny and compact, according to the sources. Plenty of countries are already using robots, such as Japan, equipped with nurse robots, and Massachusetts police are efficiently using four-legged robots for their investigation purposes.