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In the final scene, Hiro and Baymax look for Obake underwater. Baymax says he still doesn't detect his body, but Hiro says it's impossible for him to have survived. However, Baymax reminds Hiro that, like he had said, "nothing is impossible". As they search for him, Obake's chip is shown at the bottom of the sea with no damage.
- Professor Granville
- Alistair Krei
- Aunt Cass
- Kentucky Kaiju
- Security System Robots
- Bluff Dunder
- Lenore Shimamoto
- Globby (reformed)
- Noodle Burger Boy
- Buddy Guards
- Baron Von Steamer (flashback)
- Robot Obake (debut)
- Trina (minor)
- Karmi (minor)
- Wendy Wower (minor)
- Liv Amara (minor)
- Ping Pong Bot (cameo)
- Tadashi Hamada (picture and mentioned)
- Felony Carl (mentioned)
- Boss Awesome (mentioned)
- Baymax is shown as evil again, something that first happened in the film.
- Obake Baymax was first teased in the short "Baymax Dreams of Too Many Baymaxes." The name "Obake Baymax" is shown when activating captions.
- Young Obake had been shown in previous episodes, but it was officially confirmed to be him in this episode.
- In the promo of this episode, when Hiro finds out that Baymax has Obake's chip, he says goodbye while grabbing Hiro's arm to prevent him from removing the chip from Baymax's access port.
- Hiro's excuse to leave the café when talking to Aunt Cass is that he was going to collect "Obakes" on his phone. This might be a reference to the popular phone app Pokémon Go.
- For the first time in the series, the episode's name is shown in the intro.
- Krei's sculpture from "Big Roommates 2" is seen.
- Mini-Max also shows Krei photos of Globby from the same episode.
- While inside the Kentucky Kaiju with Fred and Mini-Max, Hiro is wearing a seat belt that has Big Hero 6's logo.
- When Professor Granville is looking at the window while she is telling Big Hero 6 about Bob Aken, Wasabi is seen wearing his visor and Hiro's helmet disappeared. When Professor Granville is sadly looking at Big Hero 6, Wasabi's visor is missing along with Hiro's helmet.