Countdown to Extinction

It seems like things are back to normal, but Starscream is about to shake everything up. Dangerous equipment from Dr. Arkeville's laboratory is capable of granting him more power than even he can imagine. Problem is, if Starscream isn't stopped, everyone on Earth will die in the process and Cybertron will be his. Shockwave learns what is going on and reports on it. True salvation for both planets rests on the most unlikely alliance of all Optimus and Megatron.