Hiro thinks Baymax is lost forever, until he finds the chip that Tadashi designed to create Baymax. Hiro immediately gets to work rebuilding his friend.

As Hiro tries to find a way to connect to classmate Karmi, Go Go and Fred dive deep into comic book mythology to defeat High Voltage, a mother-daughter supervillain duo.

After Aunt Cass nearly discovers Hiro's secret membership in the Big Hero 6, Hiro tries to set her up with someone to distract her.

When a monster wreaks havoc in San Fransokyo, Big Hero 6 must go on a real-life monster hunt.

Hiro and the others plan the ultimate birthday surprise for Wasabi by recovering his car from the bottom of the bay, but Baron Von Steamer ruins the celebration.

To try to prove Yama is behind a mysterious crime spree, perpetrated by tiny bots, Hiro is drawn back into the illegal world of bot-fighting.

After the gang goes to a spooky haunted house, Hiro keeps seeing Tadashi around the city and ultimately finds himself face to face with his brother.

Big Hero 6 face their greatest challenge as Obake unleashes his plan on San Fransokyo.