As the gang get ready for Wasabi's birthday, Hiro gets the idea to finally fish Wasabi's car out of the bay, all the while Obake watches from the shadows. Meanwhile, Fred feels down about not living up to his father's expectations after a statue of Boss Awesome is erected. Go Go and Honey Lemon update and fix Wasabi car, but suddenly get a message from Baron Von Steamer who plans another attack unless Boss Awesome comes. With Mr. Frederickson's help, Fred poses as Boss Awesome in an attempt to get at Steamer. Obake uses his radio frequency device to help Big Hero 6 realize that the Boss Awesome statue is really Steamer's new machine and the team, along with Wasabi's new car, successfully destroy it and arrest Steamer. Big Hero 6 realize that Obake wanted something in the water as he turns the H2O into D2O.
- 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
- Jeff Bennett as Baron Von Steamer
- Stan Lee as Mr. Frederickson
- Diedrich Bader as Bluff Dunder
- Maya Rudolph as Aunt Cass
- Andrew Scott as Obake
- Lucas Neff as Noodle Burger Boy
- John Michael Higgins as Mini-Max, Guy in shorts
- David Shaughnessy as Heathcliff, Guy in boat
- According to the amount of candles on his birthday cake, Wasabi is twenty one years old.
- Yama and High Voltage cameo in the episode as cardboard cutouts on Boss Awesome's training grounds.
- Go Go states that she is "not really a shoulder patter". This is ironic as she hugs Hiro in the movie.
- Wasabi's friends get his car out of the bay and upgrade it with various features. Based on this fact, this episode was most likely supposed to occur before "Big Hero 7".