Arkayna, Zarya, Em, and Piper - unexpected heroes who together become epic warriors - are drawn together by a prophecy to battle evil. In an effort to convince Em to have some fun and get out of the house, the Mysticons head to Maji Mall. Em is hesitant at first, although her spirits are lifted when she runs into Felix Castle, the star of a high-stakes robotics competition called Machinations. Without missing a beat - and without a plan or even a robot - Em agrees to try out at the show's next open audition! When she and Piper team up and enter the competition, they not only find themselves battling with robots, but against new friends with scorned feelings!