Quick recap
On the Maximals' homeworld, Unicron attacks, and their leader Apelinq sacrifices himself so the others can escape with the Transwarp Key. Optimus Primal hides the key on Earth. In 1994 Brooklyn, ex-soldier Noah Diaz tries to steal a Porsche that turns out to be the Autobot Mirage. Museum intern Elena Wallace finds part of the key inside a falcon statue, and its signal draws Scourge and the Terrorcons. Scourge kills Bumblebee and takes that half. In Peru, the Autobots and Maximals team up, but Scourge puts the key back together and opens the portal. Mirage turns himself into armor for Noah, the key revives Bumblebee, and Optimus Prime destroys the key, closing the portal with Unicron on the other side. The Autobots stay on Earth. Noah gets recruited by G.I. Joe.