you were joining on a battle. megatron have activated the space bridge successfully in chicago, to make cybertron collide with earth making earth one with cybertron. autobots only have around 5 hours before cybertron collide. but it was more increased sooner to 3 hours due to the strong gravitational pull.. cybertron's part were flying on the air. so do the decepticons ships and seekers, the aubobots military is highly in danger due to the driller and shockwave's appearance but seems like hound and bumblebee taken the driller in control. you just need to defeat megatron, with enough sources from nato and backups from the us military, you see the bloodthirsty brute that you used call him a brother.

"... PRIME!!! YOU HAVE REBELLED AGAINST US CYBERTRONIANS TO TEAM WITH THOSE HUMANITY SCUM?! I WILL MAKE SURE YOUR HEAD IS BATTERED!!"