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.
After defeating El Fuego, Big Hero 6 once again have been confronted by Chief Cruz and the police, they got the new robots that were created by Krei Tech Industries, the robots defeat the heroes, but they've successfully escaped.
After returning to SFIT, they explain to the remaining members about their situation with the others. Hiro goes to ask Megan to steal one of robot chips, they go to the police station in undercover and recover the chip.
They returned to the garage, Hiro says that he must write a speech about Tadashi's honor in legacy, Megan decides to support him. Then they found out that chips are having a monster symbol, same as the symbol of Obake.
Beleiving Obake's alive, Hiro tells the others about this and they can't beleive it. The Big Hero 6 go on a patrol for saving the people from drowning boat, while Hiro and Baymax went after Obake.
While they've got the boat under control, the police arrive, it was a and defeat the heroes with robots, even make Wasabi's car to drown in underwater, much to his dismay.
After arriving to the warehouse, they've been confronted by the one, none other than....Trina!
Trina greets the heroes. Hiro asks where is Obake, which Trina furiously replies that he is dead.
- Ryan Potter as Hiro Hamada
- Scott Adsit as Baymax
- Génesis Rodríguez as Honey Lemon
- Khary Payton as Wasabi
- Jamie Chung as Go Go Tomago
- Brooks Wheelan as Fred
- Nestor Carbonell as Chief Cruz
- John DiMaggio as Roddy Blair
- Isabella Gomez as Megan Cruz
- John Michael Higgins as Mini-Max
- Eric Bauza as Buddy Guardians, Detective Cato
- Zehra Fazal as Basemax, Officer Flynn
- Jenifer Lewis as Professor Granville
- Lucas Neff as Noodle Burger Boy, Police Officer
- Andy Richter as Globby
- Christy Carlson Romano as Trina
- Maya Rudolph as Aunt Cass
- Horatio Sanz as El Fuego
- Laura Silverman as Judy
- Alan Tudyk as Alistair Krei
- Chief Cruz finally realizes the error of his ways and learns Hiro and his friends are Big Hero 6.
- This is the last episode to feature a cold opening.
- Karmi makes her first physical appearance since "City of Monsters", although she doesn't speak.
- This is the first episode since Season 1 finale "Countdown to Catastrophe" to have its title appear onscreen.
- Honey Lemon, Go Go and Wasabi graduate SFIT.
- Wasabi's car gets thrown into the bottom of the bay again.
- Megan's full name and birthday are revealed in the episode.
- Trina claims that she could not find Obake, suggesting that he is gone for good.