Hiro’s microbots were stolen and duplicated! And apparently the man who stole them was up to no good. Hiro had no choice but to team up with his friends, including a plus-sized inflatable robot called Baymax to form a band of high-tech heroes in the fight against evil.

Mikrobot Hiro dicuri dan diperbanyak! Dan tampaknya lelaki yang mencuri mikrobot itu bermaksud jahat. Mau tidak mau Hiro bergabung dengan teman-temannya, termasuk robot balon gempal bernama Baymax dan membentuk sekelompok pahlawan supercanggih untuk memberantas kejahatan.