With Dr. Robotnik defeated, the Freedom Fighters, Substitute Freedom Fighters, Geoffrey St. John and a few other citizens from Knothole explore the ruins of Robotropolis. As they enter the city Rotor notices that they never really thought about the fact that the city used to be Mobotropolis, but Geoffrey and Sally remind him that they always need to put their objectives before their feelings. The group heads into the center of what used to be Castle Acorn and into Dr. Robotnik's control room. Sally asks Geoffrey to help secure the area, sparking an argument between him and Sonic. Tails and Hershey shout over them, hearing a strange noise nearby, when a DYNAMAC appears and attacks the group.