With the changelings invading, Clockwork calls in his best friend, Doctor Whooves to aid him in taking down the changeling threat. The two talk gears-to-watches on this adventure filled with fighting and smarts while trying to battle their way to the center of Canterlot to stop Chrysalis from devouring the love of all ponies. It's also Clockwork's fault Doctor Whooves ended up in Equestria in the first place. That's what he gets for being the last Timelord.