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After rescuing Abigail, the only way to go back was if Baymax sacrificed himself. Baymax asked Hiro if he was satisfied with his care, but Hiro said he couldn't lose him too like he had lost Tadashi. Baymax replied, "I will always be with you." After Baymax was sacrificed, Abigail was taken to the hospital and Callaghan was arrested. Returning to his own world, Hiro decided to attend to the University, recreating Baymax with the same chip his brother had used.

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Krei was in the midde of his speech when the superhero's arrived. Callaghan showed up with his bots and confronted Krei, stating, "You took everything from me, now I'm taking everything from you." After this, Hiro interrupted, asking Callaghan if that's what Abigail would have wanted. This did not stop Callaghan from destroying Krei and his precious company. Hiro almost got sucked up into the dangerous portal that Callaghan created with the microbots. He then figured out a way to break the bots apart. Then, when he got sucked up by the portal with Baymax, a sign of life was detected, Abigail. She was rescued.

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Hearing the news, Hiro's so angry he throws away Tadashi's smiley face chip. Baymax is now programmed to kill. He chases Callaghan & starts attacking everyone, as ordered by Hiro. Hiro's friends manage to place the good chip into Baymax, Callaghan getting away. The nerd friends say they don't want to destroy Callaghan, they just want to catch him. Hiro storms off, taking Baymax and starts to permanently take out Tadashi's chip. Baymax then activates a video of Tadashi, showing his best efforts to create Baymax, to heal not to kill. They also discover Abigail was Callaghan's daughter. Hiro then apologizes for his behavior and says they'll catch Callaghan right this time.

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Baymax's super sensor was then used to find the man in the Kabuki mask who was located in a far away island, in San Fransokyo. After arriving,  the six friends came upon a room, finding a video. In the video, an astronaut named Abigail was launched into space, where she died. The man in the Kabuki mask then attacked the friends, the friends fought back, learning the man in the mask was none other than professor Callahan. He hadn't died in the explosion, he built the bots in order to get revenge on Krei.

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After almost being killed, Hiro and Baymax went to the police station to tell them what had occurred, but they were not believed. Soon, Hiro realized that Tadashi's death was no accident, the guy in the Kabuki mask was responsible for Tadashi's death. Hiro then "updated' Baymax's programming by creating a protective armor and by teaching him karate. After this had been done for, Hiro and Baymax returned to the warehouse where they had been attacked only to get attacked once more. Skip a few minutes later, Hiro's nerd friends showed up and helped him out. After escaping the near death experience, the circle of friends came to a conclusion that Krei was the bad guy behind the mask. Hiro and his friends soon decided they had to fight back as superhero's in order to fight/defeat Krei. Each member developed fighting skills with practice.

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After following Baymax following a microbot, Hiro finally came upon a warehouse . Entering the warehouse, Hiro realized his tiny bots, just like his own, were being manifactured. A few moments later, the bots rose up, that's when Hiro realized they were being chased by a guy with a Kabuki mask, who was controlling the bots.

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While Hiro was in his room, he accidentally dropped his robot on his foot. Saying, "Ow!" Baymax activated, detecting someone was hurt. After talking about pubescence in teenagers, Baymax found a small microbot Hiro had created for the science fair, which he thought had been destroyed in the fire. Since Hiro was not "Satisfied with his care", Baymax followed where the micro bot wanted to go in order to satisfy his patient, Hiro.

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Hiro's mentor was his big brother Tadashi because he encouraged Hiro to use his talent instead of participating in illegal bot fights. Tadashi also motivated Hiro to join the University of San Fransokyo by creating an invention that would blow professor Callaghan away.

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Soon after Hiro is accepted into the University by impressing professor Callaghan with his microbots, the building catches on fire. Trying to save the professor, Tadashi goes into the burning building. Seconds later, the building explodes, killing both Tadashi and professor Callaghan. Hiro falls into depression and refuses to join the University, despite his friends urging him to; Hiro throws the registration away.

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Tadashi tricks Hiro into taking him to a bot fight but instead, Tadashi takes Hero on a tour of his lab at the University of San Fransoyko. After meeting new people, seeing inventions and learning new ideas, Hiro is inspired to join the University, deciding to join a competition to qualify to enter the University.

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Hiro Hamada is a boy who was raised by his older brother, Tadashi, and his aunt Cass following the death of his parents when Hiro was only three years old. Hiro was very advanced given his age, graduating from high school by the age of 13. Trying to cease his boredom, Hiro began to build robots and joining bot fights, which he often won, not w/out being chased, however.