Optimus Prime leads Bumblebee, Drift, Kup, Prowl, Ratchet, and Wheeljack in Las Vegas when a Cybertronian ship crashes, containing Galvatron, Cyclonus, Scourge, and an infestation of zombies from another universe. Galvatron attempts to take command of the Autobots and, after fighting them, explains his mission to stop an undead infestation. Wheeljack sets up an energy shield around the city to keep the infestation contained, but it only last for 24 hours. Despite the containment effort, Kup realizes that Bayonet, a Decepticon in Galvatron's command, is not all she seems. She turns out to be the extradimensional vampire Britt.