Fearswoop has always been dangerous, if only by accident. His passion for practical jokes inevitably crosses the line from possibly funny to almost certainly dangerous. Now, his latest exploit has brought him into contact with an ancient and mighty artifact that causes him to grow to immense size. Delighting in his newfound power, he has embarked on a riot of destruction, cackling the whole time. It's up to Sideswipe and Mudflap to find a way to stop the giant Decepticon, before the devastation threatens the entire planet.