In the aftermath of their failed invasion, the Decepticons begin stealing magic artifacts from Equestria via spacebridge to aid in their conquest. When Twilight Sparkle and her friends travel to Cybertron and attempt to stop their operation, they accidentally trigger the resurrection of King Sombra, who places Transformer and pony alike under his control. Now the Autobots, Decepticons and ponies who evaded Sombra's magic must prevent him from raising his new army and conquering both worlds.
