Momakase blackmails Hiro into helping her steal a mysterious item from Yama's safe, threatening to tell Chief Cruz Big Hero 6's secret identities if he doesn't help her.
- 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
- Naoko Mori as Momakase, Startled person
- Paul Briggs as Yama
- Isabella Gomez as Megan Cruz
- Nestor Carbonell as Chief Cruz
- Jenifer Lewis as Professor Granville
- Maya Rudolph as Aunt Cass
- James Cromwell as Professor Callaghan
- Alan Tudyk as Alistair Krei
- Zehra Fazal as Basemax
- There are several references to the film, Big Hero 6.
- Momakase makes a reference to how Obake discovered Big Hero 6's identities in "The Impatient Patient" and "Killer App".
- Megan makes several references of Big Hero 6's various battles throughout the series in her quest to learn their true identities.
- Momakase stealing Alistair Krei's gravitational device in "Food Fight".
- Dr. Mel Meyers seeked revenge after Krei double crossed him in "Aunt Cass Goes Out".
- Ned Ludd as the Hibagon attacking Krei and was saved by Mochi in "Muira-Horror!".
- Globby attacking Krei in "Big Roommates 2".
- Yama breaking into SFIT in "Baymax Returns".
- Big Hero 6 fighting Obake in "Countdown to Catastrophe".
- Karmi's transformation in "City of Monsters".
- Megan learns about the fire that killed Tadashi and realizes that Hiro is involved with Big Hero 6.