Like creatures out of science fiction, king crabs advance over the sea floor moving forward, not sideways leaving a bleak landscape behind. They came from the Pacific but now they’ve moved into the Atlantic. Scientists don’t know what the enormous crab’s limits might be and they’re very worried.

Europe's legendary pine forests are under siege. An enemy is marching ruthlessly forward, determined to destroy every tree in its path. Meet the pine processionary caterpillar a beast that devours pine forests with military precision.