On their way back to Earth Leonardo Raphael Donatello Michelangelo Twilight Rainbow Dash Pinkie Pie Rarity Applejack Fluttershy Spike Sunset Starlight Sonic Sonia and Manic along with Optimus Prime Bumblebee Sideswipe Wheeljack and Grimlock discover there's a alien shapeshifter aboard their ship meaning there's an impostor among them and they do their tasks and find out the Impostor before it gets them all