"3Below: Tales of Arcadia" follows two royal teenage aliens, Aja (Tatiana Maslany) and Krel (Diego Luna), and their bodyguard Vex (Nick Offerman), as they flee a surprise takeover of their home planet and crash-land on Earth --- in Arcadia, the same town where the events of "Trollhunters" take place. Now on the run from intergalactic bounty hunters, they must blend in and adapt to the bizarre world of high school all while attempting to repair their ship to return to and defend their home planet.