Chief Cruz and the police get the upper hand in their battle with both villains and Big Hero 6 when they begin using Buddy Guardians, powerful new robots produced by Krei Tech.

Supersonic Stu busts his grandmother, Supersonic Sue, out of prison; at school, Professor Granville asks Wasabi, who fears public speaking, to sub for an absent teaching assistant.

A new villain, Major Blast, appears in the city and targets Fred.

Fred's invisibility function on his suit glitches during patrol.

Megan confronts Hiro about being a vigilante and threatens to tell Chief Cruz the truth.

Momakase blackmails Hiro into helping her steal her family's knives from Yama's safe, threatening to tell Chief Cruz Big Hero 6's secret identities if he doesn't help her.

When Hiro finds a wrapped present in the closet, he assumes it's from Aunt Cass and takes it in order to figure out what it is. However, after a mix-up, the present becomes lost and Hiro enlists the Big Hero 6 team to track it down.

Evil villain Hardlight challenges the Big Hero 6 team to a real-life video game duel.

Nega-Globby begins to take control of Globby's body to cause chaos around the city, turning Globby from an adored hero to a wanted criminal overnight.

Professional mech-wrestler El Fuego is intent on becoming the toughest fighter in San Fransokyo and decides he must beat the strongest challenger he can find, Baymax.

When Fred runs into a string of bad luck, Megan reveals to Hiro that she's trying to uncover the true identities of Big Hero 6 for her school's newspaper.

Big Hero 6 must continue to fight off a city overrun with monsters.

Karmi and Hiro team up to help treat someone overrun with genetically engineered parasites. Big Hero 6 must fight a city being attacked by monsters.

Hiro must finish writing a story for Granville's class. Noodle Burger Boy duplicates himself and wrecks havoc.

Upon discovering Baymax's ability to detect if a person is lying, Hiro attempts to use him to uncover proof of deceit.

Big Hero 6 attempts to thwart a bank robbery and encounter Supersonic Sue, an old school roller skating villain.

Mayoi, mysterious yet adorable creatures, begin to appear in San Fransokyo.

When Hiro and Go Go accompany Krei to the woods to deal with Nedd Ludd, they run into The Hibagon, a legendary monster.

Big Hero 6 must stop a secret underground racing league.

Honey Lemon sets out to make Globby human again.

When Aunt Cass sets Hiro up on a date, he begins to wonder if he's missing out on being a regular kid.

Hiro and Fred enlist Karmi to find out what happened to Orso Knox, the man who was mysteriously turned into a monster.

Professor Granville becomes increasingly pushy with Big Hero 6 as she helps them figure out a mysterious series of food-related burglaries.

Hiro's jealousy of Karmi's internship at Sycorax leads him to intern at Krei Tech.