Big Hero 6: Big Villain 6

After an accident, Hiro disappears for more than a year and comes back with memory loss from that time.

While Hiro and his friends try to help with him, a new group of "heroes" appear out of nowhere and decides to make justice with their own hands; bloody hands.

If that's not enough, a new third power comes to the city and may help both parties with new ways of defeating evil .

It's now up to Big Hero 6 to save San Fransokyo from these new "heroes" and uncover the mistery of Hiro's memories