Plot: The Big Hero 6 finds themselves encountering the Avengers and the X-men  after an accident with Callaghan's portal. They’re transported right during a battle between the Marvel heroes and their enemies. They help them defeat the villains, and then they’re taken to the Avengers HQ, were they explain who they are and how they got there. This prompts the heroes who are also scientists to help study the portal that transported them. While messing around in their laboratory, Fred acc