Empire Magazine has three new images from Transformers: Age of Extinction, which find Autobots leader Optimus Prime and his first in command Bumblebee preparing for war as a new Decepticon threat invades earth. Both robots are getting a full upgrade in this Michael Bay directed franchise sequel. This fourth chapter in the saga takes place years after Chicago fell during the climax of Transformers: Dark of the Moon, with the humans turning against all robots. When scientists begin messing with some of the leftover technology, a new threat is drawn to earth, and its up to these out-of-commission Autobots to save the day. Take a look as they prepare for their greatest battle in what will be an all-new trilogy.