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After Callaghan was arrested, and Abigail was taken to the hospital, Hiro returned to the university. Soon after, Hiro discovers Baymax’s healthcare chip in the rocket fist it used to get Hiro and Abigail out of the portal, and this allowed Baymax to be rebuilt, reforming the team.

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After the battle, Hiro and Baymax enter the portal Callaghan was using as a weapon to save Abigail, who was still alive in the space between portals, but Baymax is required to sacrifice himself to get both Hiro and Abigail out in time.

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Hiro reconciles with the group, and they all head over to face off against Callaghan one more time. Working together, they manage to stop Callaghan this time.

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After Hiro and Baymax split off from the group, the other members rewatch the old security footage and find out that Callaghan’s daughter Abigail was part of the failed experiment.

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During the battle, the masked man gets unmasked to reveal Callaghan. This enrages Hiro, who, in a state of anger, takes out Baymax’s healthcare chip, leaving only the combat one. Before any serious harm can be done, however, the rest of the group manage to re-insert the healthcare chip.

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Arriving at the remote island facility, the team discover security recording of an experiment gone wrong, and once more get attacked by the masked man.

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One brief building and training montage later, the team is finally ready to take on the masked man. Powers include:

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Hiro, as well as the group from the university, is attacked by the masked man again. This leads them to decide to make superhero suits so they actually have a chance to figure out what's going on.

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After escaping, Hiro comes up with a plan. He downloads a ton of martial arts films, puts them on a chip for combat labelled with a skull and crossbones, and has Baymax undergo training using the content found in the films. He also makes a basic suit of armor for Baymax as well.

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After the death of Tadashi, Hiro is sulking in his room when he accidentally activates Baymax, which eventually leads to him discovering a spare micro-bot under his bed. Believing it to be broken, Hiro gives it to Baymax, who then ends up following where the micro-bot is trying to go, forcing Hiro to follow them, which all culminates in the first encounter of the masked man.

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Tadashi essentially drags Hiro to the university, where Hiro meets GoGo, Wasabi, Honey Lemon, and Fred for the first time, and is also introduced to the project Tadashi’s been working on, Baymax. The friends also help Hiro create the micro-bots, which will play a critical role.

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Hiro is shown participating in bot-fighting in a back alleyway for money. It’s assumed that he’s quite experienced, as his bot is shown easily dismantling one of his opponents’ bot’s without him even breaking a sweat.