Baymax

A story about two brothers and a robot, Baymax.
Set in a fictional metropolis called San Fransokyo (a portmanteau of San Francisco and Tokyo), a young robotics prodigy named Hiro Hamada and his robot Baymax uncover a criminal plot and pull together a team of inexperienced crime-fighters, including Wasabi, Honey Lemon, GoGo Tomago, and Fred to solve the mystery surrounding the crime.

(Source: Wikipedia)

Includes the prologue.