Earth's Mightiest Heroes and the robots with "more than meets the eye" collide! Symkaria and Latveria sit on an international powder keg, and Dr. Doom just lit the fuse! What do the Decepticons have to do with the escalating danger -- and can a group of warriors including Captain America, Optimus Prime, Wolverine, Prowl, Spider-Man and Ratchet avert Armageddon?