'At All Costs,' Part 1. On the eve of the history-making 'Worlds Collide' crossover event, Sonic's Team Fighters have reached the frigid north! The plan: finally rescue Mecha Sally. But will Silver's arrival help or hinder their efforts? Meanwhile, 'Operation: Deadly Cuddles' goes into full effect, menacing Team Freedom! It's the last stop of the road to the Sonic/Mega Man crossover event - with an explosive ending that will rock Sonic's world!