Trespasser

Trespasser was a kaiju which appeared in the 2013 sci-fi monster movie Pacific Rim and its associated media.

Description
Weighing in at a colossal 2,780 tons and standing fully 302 feet tall, Trespasser was one of the biological weapons of war sent through the interdimensional portal known as The Breach in order to conquer humanity. Vaguely humanoid in appearance with a covering of chitinous armour, it’s most distinguishing feature was the large, bony, blade-like appendage that projected from the top of its snout. The first of many kaiju to emerge from The Breach, like those who followed, it was an incredibly durable creature, impervious to any conventional weapons of the time.

History
On the 10th of August, 2013, shortly after a 7.1 magnitude earthquake off the coast of San Francisco, Trespasser surfaced as the “opening shot” in the extradimensionsl war against humanity. Quickly heading for the San Francisco Bay Area, it destroyed the Golden Gate Bridge before laying waste to the cities of San Francisco, Oakland and Sacramento over the next six days.

Despite the combined efforts of the United States military and the British Royal Air Force, Trespasser proved immune to every conventional weapon in their arsenals, and left a swathe of destruction thirty-five miles long in its wake. It was only stopped by the deployment of three tactical nuclear warheads which also annihilated every human being for dozens of miles around.